The world's largest key collection features keys to the White House, Frankenstein's castle, and Hitler's bunker.

This one-room schoolhouse in rural Arkansas dates to the 1920s, but looks like it could be the 1820s.

An outsider art studio that created a piece of work so popular they had to turn mainstream.

Town not known for anything except its strange name.

The only diamond mine in the world where you can keep what you find.

The legend of a local monster still haunts this small town.

This unusually circular centenarian barn became a Route 66 icon.

A museum packed with instruments, lyrics, and other mementos of the American folk icon.

Once in disrepair, the house where the 1983 film was shot has been restored and turned into a museum.

Twelve unique carved plaques across Humboldt tell a story of the ingenuity and bravery of ordinary citizens during the city's burning.

The ruins of the northernmost pueblo in the Americas tell the story of a mixing of native cultures.

The largest mural in the world painted by a single artist.

The oldest house in Lindsborg, Kansas, includes some fascinating inscriptions.

A statue high in a hill that represents how Buffalo Bill got his name.

These otherworldly limestone formations jut out from the Kansas prairie.

During the 1990's nearly all of the world's LSD is thought to have come from the operators of the lab once located in this missile silo.

The United States's largest hand-dug well is topped with a state-of-the-art museum.

The collection is housed in an exquisite mansion that makes you feel like you've been transported to an Italian villa.

A peculiar forest that was handcrafted for government experiments.

Travel through the hidden underbelly of the city in colorful tunnels filled with art and history exhibits.

An immersive art experience built by local arts collaborative, Factory Obscura, in the building formerly known as The Womb, a psychedelic arts center founded by the frontman of the Flaming Lips.

An acoustic anomaly with a mysterious cause.

A Google software engineer's Easter egg led to what may be the world's most unusual saved screenshot.

After retiring, Gary Pendergrass turned his yard into a wonderland of outsider art.