This frequently-photographed waterfall takes only a short hike to visit.

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

An underwater city for the dead.

Behind this beachfront shop lies a spectacular, colorful sea cave with an equally colorful past.

A favorite haunt of dinosaur loving children and hallucinogen loving hippies alike.

This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

This strange seaside tower got its name from a wealthy eccentric who would hide coins among its stones.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

A beautiful geyser under environmental threat.

Hellam Township is reputed to feature seven remote gates, which when passed through in the right order, open an entrance to hell.

This little museum is built on a theater that was once a wildly elaborate speakeasy.

An ancient pagan site swirling with legends in the foothills of Franconian Switzerland.

The name doubles as an appropriate adjective for this small ossuary.

This obscene artwork on the side of a newspaper office pokes fun at a rival paper's former editor-in-chief.

The first declared National Monument in the United States.

Home of an evil witch famous within southern folklore.

Odd outsider art installations surround a Gold Rush-era ghost town.

Towering basalt columns, a creation of fire and ice.

Mysterious rocks that ring musically when struck.

The first (but not only) upside-down house in Germany.

This enchanting mountain plateau celebrates spooky local folklore.

A beautiful 62-acre Catholic shrine and botanical garden.