Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

A faux European lane smack dab in downtown L.A.

Oh, just a motel on the edge of the desert decorated with thousands of clowns conveniently located next to an abandoned graveyard.

The superstar of Cold War nuclear bunkers has been featured in countless films but is now barely operational.

Less a museum than a bizarre fantasy world created by artists and engineers.

The highest bridge in America was built for an almost unnervingly small amount of money.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

A mysterious castle built as a monument to lost love.

The eccentric mansion of one the most popular horror authors of modern times.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

A masterpiece of LGBT art has been restored in what may now be the most valuable restroom in America.

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

Ruins of the elaborate house where the enigmatic costume designer threw glamorous parties for New York's theatrical elite.

A room in New York City that contains 250 cubic yards of dirt worth a million dollars.

After starting as a whimsical tourist attraction that eventually found its way to ruin, these renovated canals offer a lush and exotic locale on the Pacific Coast.

The largest earthwork effigy in the world.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

Hundreds of glow-in-the-dark objects light up a museum in a historic zinc mine.

More gold than anywhere else, ever.

New York City's smallest piece of private property.

The curiosities and wonders of pharmacy in a delightful historic building.

A historic neighborhood church is reborn as a psychedelic arts collective.

The inspiration for H.P. Lovecraft's horror stories and Batman's Arkham Asylum is now a condominium complex.

Tour the sci-fi-esque reality of governmental disease management.