This Arkansas town is known for its gangster history, its healing waters, and now its brews.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

Quite possibly the last cross all humans will ever see.

"the sweltering inhabitants of Charleston and New Orleans, of Madras and Bombay and Calcutta, drink at my well . . . The pure Walden water is mingled with the sacred water of the Ganges."

Louisa May Alcott based “Little Women” on her experiences growing up in this house with her sisters.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

A natural formation that resembles a camel resting in the New Mexico desert.

This small section of the Sleepy Hollow Cemetery is rotten with famous authors' graves.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

Visible below the waves are memorials to the city's Gold Rush dead.

This private residence was the template for one of the most beloved television homes of all time.

Guns that have been defending San Francisco since 1904.

A winding path built in secret on the edge of the continent.

A 300-ship graveyard, with a few still visible at low tide.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

The graffiti-covered remnants of a former triangulation station are balanced precariously on this California peak.

This residential door allows San Francisco muggles a glimpse at the wizarding world.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

The miraculous hydrant that saved the Mission District in 1906.

This abandoned bootleg attraction was built to cash in on the popularity of classic TV show, F Troop.

See massive fossils that are over 200 million years old in northeastern Arizona.

Legends surround this jagged rock formation in the New Mexico desert.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.