1

The Statue of Liberty’s color

Image: Pierre Blaché

We start our list with a moderately well-known fact: the Statue of Liberty’s beautiful emerald color is not original. Technically, it’s a sign of damage. While the statue's infrastructure is made of iron, its exterior is copper, which has turned green over time due to oxidation .

Fortunately, that same green coating now protects the statue from further damage and deterioration.

2

Grand Central Terminal’s hidden club

Image: David Vives

A busy train station may not seem like the ideal place for a social club, but that’s exactly the case with the Explorers Club. Operating for decades, this exclusive venue primarily serves locals, featuring a full gym, an indoor hard court, and even a smaller secondary court .

3

Gateway Arch’s time capsule

Image: Chris Hardy

This beloved St. Louis landmark holds a secret at its peak: a time capsule was placed inside the arch in 1965 , containing 762,000 signatures—many from students who attended St. Louis schools at the time.

The capsule is permanently welded inside the arch and will remain sealed for as long as the structure stands.

4

New York's High Court Building’s ball court

Image: Markus Spiske

New Yorkers seem to have a penchant for sports courts hidden on the top floors of iconic buildings—this one being the second on our list. The New York High Court Building is primarily a place for legal proceedings and bureaucratic work, but on its fifth floor, visitors will find a basketball court known as the "Highest Court in the Land."

5

The White House’s dentist

Image: Benyamin Bohlouli

It’s easy to imagine hallways and rooms filled with endless state secrets in the White House basement. But what most people won’t guess is that you can also find a dentist’s office, a carpenter’s shop, and even a bowling alley down there.

6

Niagara Falls is a huge faucet

Image: Tosab Photography

As strange as it sounds, this statement is true in a sense. The complex system of pumps and gates that administer the water of the Falls can be controlled by a central command.

In fact, part of Niagara Falls is even scheduled to be "turned off" in the coming years to replace some obsolete structures—just like a faucet.

7

Washington Monument’s Civil War graffiti

Image: Sonder Quest

Graffiti has been around all over the world, for a couple of centuries now. The Washington Monument was still under construction when the Civil War broke out, and Union soldiers stationed there carved their names and drew pictures onto the monument . These markings can still be seen today at its base.

8

Mount Rushmore’s hidden room

Image: Jéan Béller

One of America’s most famous landmarks hides a secret room known as the Hall of Records , which is filled with documents intended to preserve the nation’s history for future generations. This hidden chamber is accessed through a concealed door behind Abraham Lincoln’s ear.

9

Lincoln Memorial’s secret carvings

Image: Andy Feliciotti

Speaking of Lincoln, you’ll need a flashlight to spot this one—but it’s there. On the north wall stone of the Lincoln Memorial, the letters "EBL" can be seen carved . These initials stand for Evelyn Beatrice Longman, the artist who sculpted the memorial’s ornamental border.

10

Empire State Building’s secret floor

Image: Kit Suman

As it turns out, the Empire State Building has one more floor than the famous 102. This extra floor was originally constructed for building maintenance but now serves as an exclusive hotspot for celebrities, complete with an ultra-thin, knee-high railing separating observers from the sky surrounding them.

11

Brooklyn Bridge’s wine cellars

Image: Partha Narasimhan

Wine cellars are cold and dark places—just like the basements at the Brooklyn Bridge’s bases. This connection, now quite obvious, was made by the bridge’s engineer, Washington Roebling, who incorporated two full wine cellars into the bridge’s bases on each side and then rented the space to local businesses who needed the extra storage.

12

Disneyland’s secret members-only club

Image: Travis Gergen

If a trip to Disneyland isn’t enough of a Disney experience for you, there’s an exclusive club on the premises called Club 33 . This exclusive joint boasts an invite-only guest list, where members must pay anywhere from $25,000 to $100,000 to join, with annual membership dues ranging from $12,500 to $30,000. Do you think it’s worth it?

1

Harriet Tubman secretly worked as a Union spy

Most Americans know Harriet Tubman for her leadership of the Underground Railroad, but during the Civil War, she also became a Union scout and spy in South Carolina. Working with Colonel James Montgomery, Tubman gathered intelligence from enslaved people living behind Confederate lines near the Combahee River .

In June 1863, Tubman helped lead the Combahee River Raid, guiding Union gunboats through Confederate waters filled with hidden mines. The operation freed more than 700 enslaved people and made Tubman the first woman known to lead a major U.S. military mission.

2

Julia Child worked for the U.S. intelligence agency

Before becoming television’s most famous chef, Julia Child joined the Office of Strategic Services, or OSS, in 1942 during World War II. The OSS later evolved into the CIA. Too tall to enlist in the Women’s Army Corps, Child instead classified files and overseas communications in Asia.

One of her strangest assignments involved helping researchers develop shark repellent for Navy explosives and emergency rescue kits . The repellent used copper acetate and black dye to create an odor similar to a dead shark.

3

Benjamin Franklin conducted unofficial spy work in Europe

Benjamin Franklin was more than a scientist and Founding Father. During the American Revolution, he quietly acted as an intelligence organizer while serving as ambassador to France beginning in 1776 . Franklin cultivated secret alliances, intercepted information, and used coded correspondence to support the colonies’ fight against Britain.

Operating from Paris, Franklin built relationships with French officials and helped persuade France to support the American cause with money, troops, and naval power. Historians consider his diplomatic intelligence efforts essential to the American victory at Yorktown in 1781 and eventual independence.

4

Louisa May Alcott published thrillers under another name

Louisa May Alcott became a literary icon after publishing Little Women in 1868, but few readers knew that she had already written sensational thrillers under the pen name "A.M. Barnard." These stories featured revenge, hidden identities, forbidden romance, and dramatic crime plots that shocked Victorian audiences.

Alcott used a pseudonym because publishers often expected women writers to produce respectable domestic fiction. Many of her darker stories remained forgotten until scholars rediscovered them in the 1940s. Today, titles like Behind a Mask reveal a far more rebellious side of the beloved author.

5

Maya Angelou worked as San Francisco’s first black female cable car conductor

Long before becoming a celebrated poet and author, Maya Angelou made history in San Francisco during the 1940s. At only 16 years old, she applied repeatedly for a conductor job on the city’s cable cars after seeing an advertisement that excluded Black applicants .

Angelou refused to give up despite repeated rejection. She eventually became San Francisco’s first Black female cable car conductor in 1944. Years later, she described proudly wearing the blue uniform while working long shifts across the city before launching her writing and civil rights careers.

6

Dr. Seuss created classified wartime propaganda films

Before writing Green Eggs and Ham and The Cat in the Hat , Theodor Geisel, better known as Dr. Seuss, worked on wartime propaganda during World War II. Between 1943 and 1945, he joined director Frank Capra’s Signal Corps unit to produce military training films for American soldiers .

Geisel also drew political cartoons supporting the Allied war effort and criticizing fascism. Some of his films were classified during the war because they contained military training material. His animated work helped explain battlefield strategy and morale issues to thousands of U.S. troops overseas.

7

Babe Ruth once played an entire game with a fever over 102 degrees

In 1925, Babe Ruth became seriously ill during spring training and collapsed while traveling by train . Newspapers nicknamed the incident "the bellyache heard around the world." Reports from the time described Ruth suffering from a fever above 102 degrees while still insisting on returning to baseball activities.

Despite his condition, Ruth’s determination became part of baseball legend. The illness hurt his performance during the 1925 season, when the New York Yankees finished seventh in the American League. Even so, Ruth rebounded quickly and helped lead the Yankees to championships in later years.

8

Harry Houdini worked with police departments

Harry Houdini’s famous escape acts fascinated police departments across America and Europe in the early 1900s. Officers regularly challenged him to escape from handcuffs, prison wagons, and locked jail cells. Houdini often invited local police to inspect restraints before his performances began.

Beyond entertainment, Houdini also worked closely with law enforcement to expose fraudulent mediums and fake spiritualists during the 1920s . Using his knowledge of locks, hidden compartments, and deception, he publicly demonstrated how many supposed supernatural tricks were actually carefully staged illusions.

9

Frank Lloyd Wright hid a private apartment inside one of his buildings

Architect Frank Lloyd Wright secretly maintained a private apartment inside his famous Oak Park Studio near Chicago, Illinois. Built in the 1890s, the studio served as both his workplace and personal retreat while he designed many of his early Prairie-style homes across the Midwest.

The hidden living quarters allowed Wright to work late into the night and host select guests away from public attention. The building itself became one of the most important centers of American architecture, producing groundbreaking residential designs that influenced modern architecture around the world.

10

Muhammad Ali quietly funded humanitarian causes for years

Muhammad Ali’s boxing fame often overshadowed his enormous charitable work. For decades, Ali quietly donated money to hospitals, food programs, children’s charities, and international humanitarian efforts . Friends and family later revealed that many of his contributions were intentionally kept private.

In 1990, Ali traveled to Iraq during tensions leading up to the Gulf War and helped secure the release of 15 American hostages. He also supported global relief organizations and Parkinson’s disease research after his own diagnosis. In 2005, President George W. Bush awarded Ali the Presidential Medal of Freedom.

1

Carhenge – Alliance, Nebraska

Image: John Dame

Imagine driving through the Great Plains and stumbling across Stonehenge—only this version is made entirely of old cars. That’s Carhenge. Built in 1987 by artist Jim Reinders, this auto-art installation mirrors the original monument’s dimensions using vintage American cars, all painted gray. It’s history with a humorous twist, you know!

2

Salvation Mountain – Niland, California

Image: Megan Ellis

Located near the edge of the desert, Salvation Mountain is a wonder filled with color and faith. Leonard Knight spent decades slathering adobe and straw with thick coats of paint, spreading a message of love through hand-lettered Bible verses. You don’t have to be religious to appreciate the heart behind this monument—it’s pure passion on display.

3

The Enchanted Highway – Regent, North Dakota

Image: Carol Highsmith's America

This isn’t your average country drive. The Enchanted Highway is a 32-mile stretch of open road lined with enormous metal sculptures—everything from geese in flight to grasshoppers the size of RVs. Created by Gary Greff, a small-town schoolteacher turned roadside visionary, this whimsical parade of artwork proves that a little welding—and a lot of heart—can turn even the quietest town into a road trip highlight.

4

The Paper House – Rockport, Massachusetts

Image: Unlimited Access

If you’ve ever wondered what to do with old newspapers, how about building a house? In the 1920s, engineer Elis Stenman did just that. The walls, furniture—even the curtains—are made from varnished newspapers. It’s cozy, clever, and surprisingly sturdy. Part architecture, part recycling marvel, this little New England oddity is well worth the detour.

5

The Museum of Bad Art – Boston, Massachusetts

Image: Marishka Tsiklauri

Some artwork takes your breath away. Other pieces make you laugh out loud—and that’s exactly the goal at the Museum of Bad Art. This small but mighty gallery celebrates delightfully terrible creations. It’s not about mocking; quite the opposite. It’s about finding joy in the offbeat and honoring artists who dared to create something totally different. Trust us—you’ll leave smiling.

6

The Unclaimed Baggage Center – Scottsboro, Alabama

Image: Raquel Brepohl

Ever wonder where your missing suitcase ended up? Chances are, it’s here. The Unclaimed Baggage Center is part retail store, part treasure hunt. Spread across 40,000 square feet, it sells items left behind at airports—from clothes and gadgets to the occasional surprise oddity. If you enjoy thrifting, this is a must-stop on your trip.

7

The Wigwam Motel – Holbrook, Arizona

Image: Johnathan Ciarrocca

Nothing screams classic Americana like Route 66, and the Wigwam Motel delivers. Here, you’ll sleep in your very own concrete teepee. It’s one of only three surviving "Wigwam Villages" from the 1950s. It’s kitschy, it’s cozy, and it’s a nostalgic nod to the road trips of yesteryear. Want a bonus? Check out the vintage cars parked out front.

8

The House on the Rock – Spring Green, Wisconsin

Image: Cristina Glebova

Imagine a mansion crossed with a carnival funhouse—that’s The House on the Rock. Started in the 1940s by Alex Jordan Jr., this labyrinth of rooms features bizarre collections, from a giant carousel to self-playing orchestras and a hall filled with model ships. It’s overwhelming, wonderful, and completely unforgettable—a place where your inner child will be wide-eyed the entire time.

9

The Grotto of the Redemption – West Bend, Iowa

Image: Mustafa akın

Part spiritual sanctuary, part geological marvel, the Grotto of the Redemption is made of millions of stones, gems, and fossils. Started by Father Paul Dobberstein in 1912, this labor of love took over 40 years to complete. The result? A jaw-dropping series of religious scenes and structures that glitter in the sunlight. Bring your sunglasses—you’re in for a dazzling experience.

10

The UFO Watchtower – Hooper, Colorado

Image: Gabriel Tovar

For those who believe in aliens—or just love a good alien yarn—the UFO Watchtower is a must-see. Located in the San Luis Valley, a hotspot for sightings, this quirky site offers 360-degree views of the sky, a garden filled with visitor trinkets, and plenty of stories. Try it out—what if you spot a flying saucer? Let’s face it, we’re all a little curious about what’s out there.

11

The World’s Largest Ball of Twine – Cawker City, Kansas

Image: Amie Bell

It started small. Then the neighbors added to it. Then visitors joined in. Now, it’s a Midwest legend. The World’s Largest Ball of Twine keeps growing, with a yearly "twine-a-thon" that invites everyone to contribute. It’s quirky, community-powered, and a great example of how something ordinary can become roadside-worthy.

12

The World’s Largest Collection of the World’s Smallest Versions of the World’s Largest Things – Lucas, Kansas

Image: Nik

Yes, that’s the real name. And yes, it’s every bit as whimsical as it sounds. Artist Erika Nelson created this traveling museum of tiny replicas, honoring America’s obsession with "world’s largest" attractions. It’s part satire, part celebration, and completely charming.