1

Grand Prismatic Spring

Image: MikeGoad

The steaming, multicolored circle of the Grand Prismatic Spring is one of the most hypnotic and unique sights in the U.S. Part of Yellowstone National Park, this hot spring is the largest in the country and the third-largest in the world, measuring 370 feet wide and 160 feet deep.

Its vibrant colors, ranging from deep blue in the center to fiery red and orange at its edges, are unlike anything we see in nature every day. Minerals and microbes are responsible for these hues, with water temperature causing the pigments to fluctuate . The spring owes its existence to geothermal activity driven by Yellowstone's underlying magma chamber and is located in the Midway Geyser Basin.

2

Fly Ranch Geyser

Image: Ken Lund, CC BY-SA 2.0

One of the reasons why Fly Ranch Geyser is unique in the world is that it was formed after a human accident . This technicolor geothermal geyser, located on the Fly Ranch property in the Hualapai Geothermal Flats of Washoe County, Nevada, wasn’t there before 1916.

In 1916, while drilling a well for irrigation in the area, workers struck near-boiling geothermal water, leading to the creation of the first geyser. Decades later, in 1964, a geothermal energy company drilled a second well nearby, which caused the emergence of the Fly Geyser we know today. It has been spouting water into the sky ever since, forming several cone-like vents atop a mound that continues to grow.

3

Devil’s Kettle

Image: chrishawaii

Where does the water from the Brule River go when it falls? For a long time, this was a mystery. Located in Judge C.R. Magney State Park near Grand Marais, Minnesota, along the North Shore of Lake Superior, the river is famous for its unusual split: one half flows downstream, while the other plunges into a seemingly bottomless hole .

This waterfall has baffled visitors and scientists for years because objects thrown into the "kettle," such as logs and ping-pong balls, appeared to vanish without resurfacing. This fueled theories of underground rivers or deep caverns beneath the falls. The mystery was solved recently when hydrologists discovered that the water entering the kettle resurfaces downstream . The kettle's strong currents explain why objects thrown in don’t resurface; they are broken apart and held underwater, functioning like a natural washing machine.

4

Mono Lake Tufa Towers

Image: Stephen Leonardi

These unique limestone formations, known as the Mono Lake Tufa Towers, emerge from the salty, alkaline waters of Mono Lake , fed by underwater springs. Located in eastern California, near the Sierra Nevada mountains and about 13 miles east of Yosemite National Park, they are a striking natural wonder.

These tufa towers rise dramatically from the water. How were they formed? Mono Lake has no outlet, so its high alkalinity and salinity caused minerals to accumulate over time. This unique environment supports an ecosystem of brine shrimp, alkali flies, and migratory birds. To give you an idea, the lake’s salinity is more than twice that of the ocean, which means you could float effortlessly in its waters, as many visitors do.

5

Crater of Diamonds

Image: Brett Sayles

If you find a diamond here, you get to keep it—this is the only diamond-bearing site in the world where that's possible. Open to the public for mining , the Crater of Diamonds is a 37.5-acre field located near Murfreesboro, Arkansas. It marks the eroded surface of a volcanic pipe composed of lamproite, a rare volcanic rock.

Visitors sometimes find diamonds of various colors, including white, yellow, and brown, along with other gems like amethyst and garnet. It was here that the "Uncle Sam Diamond" was found, the largest diamond ever dug out in North America, weighing 40.23 carats. Diamonds were first discovered here in 1906 when a local farmer found unusual crystals on his land, which sparked a minor diamond rush.

6

Antelope Canyon

Image: Roberto Lee Cortes

Rocks that look like flowing water: Antelope Canyon is a famous and breathtaking slot canyon in northern Arizona. It consists of two main sections: Upper Antelope Canyon (a.k.a. Tsé bighánílíní, or "the place where water runs through rocks") and Lower Antelope Canyon ( Hazdistazí, or "spiral rock arches").

The canyon was formed over millions of years as flash floods and desert winds eroded the Navajo Sandstone. Even today, seasonal flash flooding continues to shape and carve the canyon’s mesmerizing features. Its surreal, wave-like formations in shades of orange are a favorite subject for photographers and tourists from all over the world.

7

Petrified Forest

Image: Megan Clark

The Petrified Forest National Park in northeastern Arizona boasts one of the world's largest and most vibrant concentrations of petrified wood . The park, part of the Painted Desert, is located between the Apache and Navajo Counties.

Most of the wood found there is from ancient conifer trees that date back about 225 million years to the Late Triassic period. These trees were swept into river systems, buried by sediment, and transformed into stone through a process called permineralization . The park also features a wealth of fossilized remains of ancient animals, including early reptiles.

8

Devils Tower

Image: Kyle Petzer

The Devils Tower stands alone, protruding dramatically from the plains. Considered sacred by Native American tribes, it was originally called "bad god’s tower," a name that eventually evolved into its current form. Located in northeastern Wyoming, this igneous rock monolith soars 867 feet above its base.

It was designated the first U.S. National Monument by President Theodore Roosevelt in 1906. Geologists agree that Devils Tower was formed through the intrusion of magma into sedimentary rock layers about 50 to 60 million years ago. Today, climbers from around the world are drawn to its sheer walls, though climbing is prohibited in June to honor Native ceremonies.

9

The Wave

Image: Mark Nemenzo

The Wave is a visually stunning sandstone formation located in the Coyote Buttes North area of the Vermilion Cliffs National Monument. Known for its hypnotic, swirling bands of red, orange, and yellow, its delicate ridges are so easily damaged that even one misplaced footstep could ruin the beautiful patterns.

Approximately 185 million years ago, this area was a vast desert covered in dunes. Over time, layers of sand were deposited, compacted, and cemented, forming this Navajo sandstone shape. Unfortunately, The Wave is only accessible by a challenging hike that requires a permit, due to the fragility of its ecosystem and high demand from visitors. With less than 5% of applicants obtaining a permit each year, it is one of the most exclusive hiking destinations in the world.

10

Kasha-Katuwe Tent Rocks National Monument

Image: Bruce Warrington

The Kasha-Katuwe Tent Rocks National Monument, located in northern New Mexico, displays a unique landscape of tall, cone-shaped rock formations. These "tent rocks," composed of pumice and tuff, are known as "hoodoos." They are natural formations ranging from a few feet to approximately 90 feet tall.

The name "Kasha-Katuwe" means "white cliffs" in the Keresan language of the Cochiti Pueblo. Hiking trails, such as the Slot Canyon Trail, offer visitors the opportunity to explore the cones up close while walking through dramatic, narrow canyons.

1

Thomas Edison

Image: Call Me Fred

When it comes to inventors, we can't fail to mention the incredible Thomas Alva Edison.

Edison was born on February 11, 1847, in Milan, Ohio, and since he was a child, he showed his interest and talent in mechanics and electricity. At the age of 11, he set up his first laboratory in his parents' home, and by the age of 12, he ran his own business: a newspaper he designed, printed, and sold himself.

Creator of the phonograph (the first device capable of recording and reproducing sounds) and a fundamental part in the development and popularization of inventions such as the electric light bulb and the motion picture camera, Edison patented more than 1000 creations during his lifetime. Impressive!

2

Benjamin Franklin

Image: Dan Mall

Born in Boston, Benjamin Franklin was one of our Founding Fathers, the men whose principles, values, and ideas shaped America. But as if that weren't enough, Franklin was also a renowned scientist, inventor, and polymath.

A pioneer in the field of electricity, he's remembered for his famous kite experiment, which demonstrated the electrical nature of lightning and led to the invention of nothing less than the lightning rod. In addition, he's also credited with iconic inventions such as the first efficient wood-burning stove (later known as "the Franklin Stove"), the bifocal glasses, and the glass armonica.

3

Samuel Morse

Image: The New York Public Library

Unlike other scientists and inventors on this list, Samuel Morse began his journey in a completely different field: art.

Morse studied at Yale, where he completed his studies in 1810. He then embarked on a trip to Europe to continue his artistic education, but this trip awakened another peculiar interest in him. Frustrated by the communication methods of his time, Morse focused his creativity on finding ways to transmit information over long distances using electrical signals. Thus, the revolutionary telegraph was born, along with its way of communication, the Morse code.

4

The Wright Brothers

Image: Simon Fitall

The Wright Brothers were the famous siblings who, in the 20th century, achieved a goal long sought by humanity: flight.

Wilbur and Orville Wright are credited with inventing, building, and flying the world's first successful airplane. As you probably know, on December 17, 1903, they made the first sustained flight in history using the Wright Flyer, their iconic invention.

On that December morning, the brothers flipped a coin, letting fate decide who would be the first to test the aircraft. Although Wilbur won, that first attempt failed. So it was Orville who flew for 12 seconds, traveling 120 feet over Kitty Hawk, North Carolina.

5

George Washington Carver

Image: Tom Hermans

George Washington Carver was born in the 1860s in Diamond, Missouri. In the 1890s, his intelligence and hard work enabled him to enter Iowa State College (now Iowa State University), where he earned a master's degree in agricultural sciences. In 1896, he became the head of the agriculture department at Tuskegee Institute in Alabama, where his career as a professor and a researcher took off.

Thanks to his investigations and tests, George Washington Carver made major contributions to agriculture, including his innovative techniques for crop rotation . In addition, he developed many and varied peanut products, such as oil, flour, soap, and ink, helping to make this crop one of the key products of the country's economy.

6

Carl Sagan

Image: Vaibhaw Kumar

The stars and the mysteries of the universe captivated the famous Carl Sagan from an early age. Born in Brooklyn, New York, in 1934, Sagan studied at the University of Chicago, where he earned degrees in physics, astronomy, and astrophysics, eventually working and collaborating with NASA.

His contributions to the field of astronomy earned him a position in projects such as the Mariner, Viking, Voyager, and Galileo missions, thanks to which we have learned a lot about Venus, Mars, and Jupiter. The famous high temperatures of Venus, for example, were confirmed thanks to his work.

Additionally, his book and series Cosmos attracted the public's interest in astronomy, inspiring many others to follow in his footsteps.

7

Grace Hopper

Image: Museums Victoria

While computer programming may seem like a modern issue, the pioneers of this field were already working as early as the 1940s.

Grace Hopper graduated in mathematics and physics in 1928 and obtained a master's degree and a Ph.D in mathematics from Yale University in 1934. Famous as a pioneer in the world of programming, Hopper's work began during World War II when she joined the US Naval Reserve. There, she worked on the earliest electromechanical computers and developed extensive and complex manuals to operate them.

Her greatest contribution came from her work with mathematical codes, which she translated and adapted into innovative machine-readable language. That innovation led to the creation of the first high-level programming languages.

8

Jonas Salk

Image: Олег Мороз

Jonas Salk is none other than the mind behind a medical milestone: the polio vaccine.

In the 1940s, Salk was beginning his career in medical research. While working at the University of Michigan, his work was crucial in developing the first successful influenza vaccine for the military during WWII. This event marked his later study of the poliovirus.

Polio was devastating during the first decades of the 20th century, but that changed dramatically thanks to Salk's work. The scientist led a team that succeeded in developing the first safe and effective injectable inactivated poliovirus vaccine (IPV) in 1955, and the rest is history.

9

Barbara McClintock

Image: digitale.de

Although her name may not be as instantly recognizable as some others on this list, her work definitely is. Barbara McClintock has undoubtedly made one of the most significant contributions to medicine and genetics.

In the 1940s and 1950s, she worked with chromosomes, investigating their role in inheritance, which led to discoveries that forever changed our understanding of genes.

Before her, genes were believed to be fixed and immutable. But McClintock came to change that idea with her most famous contribution: the discovery of transposable elements, aka "jumping genes." She demonstrated that jumping genes are present in multiple organisms, including humans, and play an essential role in genetic evolution.

10

Alexander Graham Bell

Image: Misho Tektumanidze

Alexander Graham Bell became interested in sound and communication at a young age, something that led to his greatest and most remembered contribution: the telephone.

Although born in 1847 in Edinburgh, Scotland, Alexander Graham Bell settled in the United States in 1871 and became an American citizen years later. It was here that he developed most of his experiments and research.

After years of experimenting with methods to transmit sound through electrical currents, Bell finally spoke into his invention on March 10, 1876, saying to his assistant, "Mr. Watson, come here. I want to see you." That was the first successful telephone call in history.

1

World's largest office building

Image: Clem Onojeghuo

Among its many record-breaking achievements, America has one lesser-known record that also deserves attention.

Our country is home to the largest office building in the world. Want to know which one? The world's largest office building by floor area is the United States Department of Defense, also known as the Pentagon.

Ok, but how big is it? Located in Arlington, Virginia, and famous not only for its size but also for its distinctive five-sided design, the building has a total floor area of approximately 6.5 million square feet.

2

People in New York

Image: Nicolai Berntsen

We all know that New York City is packed with people. In fact, it's the most populous city in our country. But how many live there?

As of 2024, around 8.8 million people call NYC their home. That's a huge number on its own, but it might be even more impressive when you consider that NYC's population surpasses that of 40 US states, including Montana, New Hampshire, and Mississippi, to name a few. In other words, NYC has more residents than each of those 40 states individually.

After all, New York City is famously known as "the city that never sleeps" for a reason!

3

Many versions of the flag

Image: Chris Hardy

The US flag is one of our most beautiful and beloved symbols and also one of the most recognized worldwide. With its distinctive stripes, stars, and classic red, white, and blue colors, it is an unmistakable icon. But did you know it has undergone several changes over the years?

The US flag has not just had 1, 2, or 3 versions; in fact, there have been 27 official versions! Each of these versions served an important purpose, reflecting some key changes throughout our history. For example, whenever a new state joined the Union, an additional star was added. This is how we arrived at the 50 white stars you see in the upper left corner of our beautiful flag. The current version was made official on July 4, 1960.

4

No official language

Image: Ben Duchac

While English is the most widely spoken language in the United States, the country does not have an official language at the federal level.

This might surprise some people, given that English is the primary language for most Americans and is used for government and legal purposes.

On the other hand, many other languages are spoken here as well. For instance, Spanish is the second most spoken language, though it is used considerably less than English. And that's not all; Chinese, Filipino, and French also have a notable number of speakers in the US!

5

The fastest-speaking states

Image: Chris Liverani

We all have that friend who speaks so fast it's hard to keep up, even if you know them well. Would you like to know how fast Americans speak?

Fortunately, there's not just data on the languages we use but also on how quickly we speak in our daily lives. And it turns out that a few states lead the pack in this speed race.

According to the Smithsonian Institution, Oregon, Minnesota, and Massachusetts are the states where residents speak the fastest . So, if you know someone from those states, why not give it a try and see if you can keep up with their speedy conversations?

6

Most airports in the world

Image: Alex Underwood

Americans seem to love air travel, and there's a good reason for that: the US holds the record for the most airports in the world!

This isn't just a coincidence. The vast size of our territory— yes, we're one of the largest countries in the world—requires fast, safe, and efficient ways to travel to all corners.

With thousands of airports of all kinds spread across the country, it's no wonder that so many movies feature airport scenes or are even filmed inside airplanes, right?

7

Alaska's price

Image: Joris Beugels

We have the great advantage of having the gorgeous state of Alaska as one of the 50 states. Beyond its natural beauty, it holds another impressive distinction: it's the largest state by area, covering approximately 663,300 square miles.

As you may know, Alaska was purchased in 1867 when US Secretary of State William H. Seward sealed a deal with Russia to acquire the territory. However, what some people may not know is just how affordable it was: the purchase cost $7.2 million, which means we acquired Alaska for about 2 cents per acre! To put it in perspective, adjusted for inflation, that $7.2 million would be equivalent to about $140 million today.

8

The first national park in the world

Image: Nicolasintravel

The United States is home to some of the most spectacular and diverse national parks in the world. And not only that, but we also have the honor of being the country that established the world's very first national park.

Inaugurated on March 1, 1872, Yellowstone National Park became the Earth's first national park. This event marked a turning point, leading to the creation of many other national parks and protected areas both in America and around the globe.

The incredible Yellowstone spans approximately 3,472 square miles , primarily in Wyoming, with portions extending into Montana and Idaho. Have you had the chance to visit it?

9

A special feature on Washington National Cathedral

Image: Ryan Arnst

The Washington National Cathedral offers many attractions for visitors, starting with its beautiful Gothic-style architecture. However, it also holds some secrets and fun facts within its walls.

Construction began in 1907 and took 83 years to complete. The wait was well worth it, as the Washington National Cathedral is now the sixth-largest in the world! And here's a fun fact: its famous Space Window features a real piece of moon rock at its center. Amazing!

Additionally, there's also a quirky feature that some visitors overlook: on the Cathedral's façade, there's a gargoyle with the face of none other than Darth Vader! This Star Wars character was added to the building's northwest tower in the 1980s after a children's design competition. A curious touch, isn't it?

10

Miles of bookshelves

Image: Roman Kraft

The Library of Congress is much more than a beautiful complex of buildings. Located on Capitol Hill in Washington, D.C., this famous landmark was established over 200 years ago in 1800 . Since then, it has preserved and protected countless documents, treaties, and books that reflect and constitute our nation's history.

Adding to our list of world records, the Library of Congress holds the title of the largest library in the world. It boasts an incredible 164 million items, which translates to 838 miles of bookshelves. That's enough to cover the distance from Atlanta, GA, to New York City, NY!