This spire on an Austrian mountain is wrapped around a long spiral slide and has the world's tallest wooden observation deck.

This massive subterranean fissure is known as the "underground Grand Canyon."

When the sun sets, the customers arrive—but they’re not human.

An underwater restaurant, surrounded by a coral reef.

A narrow, serpentine spit of sand is constantly eroded and rebuilt by competing currents.

Fine dining 20 feet below the surface in the Indian Ocean.

Bioluminescence in the reefs of the Maldives causes the sea to glow like a starry night sky.

The world's seventh-largest coral reef contains an incredible amount of biodiversity.

"If she'd leave us alone, we would have a happy home, sent from down below."

An enormous dragon scales the walls of this 17-story temple.

A theme park that suffered massive flooding during Katrina was abandoned, and now proves irresistible to trespassing explorers.

A brick-lined alley full of public artwork tucked away in downtown Gulfport.

A small museum celebrating the work of a Mississippi artist who had a unique connection with the natural world.

After the comedian dissed a Connecticut town on his show, they named a sewage treatment plant after him.

A unique attraction and museum dedicated to exploring iconic roadside structures.

Devilish landscape, once cinema home to giant alien bugs, now derelict roadside attraction.

The remote outlaw hideout of Jesse James, Butch Cassidy, and the Sundance Kid.

Long before guestbooks and hotels, frontier travelers signed their names on this rock face.

An impressive collection of over 50,000 minerals including moon rock from the Apollo 17 mission.

An artist-run shop filled with art inspired by and made from nature.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

This unassuming building houses one of the world's most extensive collections of cars created by automotive legend Carroll Shelby.

This modern antique shop is a museum for 1980's Saturday morning cartoon culture.

Explore some of the most unique vehicles in history along with a cast of unsettling mannequins.