Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

A herd of 150 bison live on California's Santa Catalina Island and are at the heart of an ongoing debate between environmental protection and economic expansion.

A legendary speakeasy bookstore returns from the brink.

A spiritual retreat in the heart of Los Angeles offers stunning gardens and a labyrinth to lose yourself in.

A sewing machine tycoon built this miniature castle for the people and to beautify a lakeshore.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

Ancient pueblos built into the base of a natural canyon wall.

An enthusiastically interactive mining museum that won't let black lung ruin the fun.

This temple, built by an eccentric religious leader before his death, sits guarded and in ruins.

One of the most unusual geological features, recognizable from a dozen hit movies.

Version of the French Riviera destroyed by the sea.

This serene oasis in an affluent Los Angeles neighborhood holds some of Gandhi's ashes and got Elvis into Eastern Philosophy.

Hidden away in the city of Madison, Wisconsin is a nearly forgotten home that Frank Lloyd Wright built for a childhood friend.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

The famed architect designed this Minnesota gas station of the future with a lookout tower.

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.

A house turned museum is the real-life "home" of the fictional main character of The Wizard of Oz.

Massive still life just off the highway in Kansas.

The haunting ruins of Jack London's dream house.

Could this grave be the true resting place of legendary gunfighter "Doc" Holliday? Unclear.

The deepest sinkhole in Central Europe comes with a grisly tale and an unusual nickname: “The Stepmother Abyss.”

Mummified monks and the accidentally interred, in a 17th-century crypt.

The world's greatest slide descends 18 stories from this looping mountaintop viewing platform.

This unusually shaped mountaintop tower looks like a UFO floating over the city.