This long, dark tunnel is open to hikers, but those without lights are known to get confused even on the straight path.

Unparalleled stargazing, one of Colombia's best observatories, and a swimming pool can all be found in the middle of this ancient tropical forest.

Former drug lord’s manor, now a theme park. Watch out for the hippos.

Hidden amid the tropical forest in the Caribbean Sea are the decaying ruins of the Cocaine King's luxurious island party home.

This once-booming gold mining hub was basically abandoned overnight.

A series of eerie metal stick figures are spread out over four square miles on the bed of a huge salt lake in the Australian Outback.

A museum of memories in what was once one of the most violent cities in the world.

An unusual and beautiful form of mass transit serves the city's steepest neighborhoods.

The wild west is still alive and well at this authentic mining town watering hole.

One small town in the Pacific Northwest transformed itself into a Bavarian-themed tourist destination.

A Hawaiian stairway to heaven—that you can't climb.

An authentic replica of an Asian temple and garden hidden amongst the natural beauty of Hawai'i.

The grand marquee of this abandoned Hawaiian theater remembers the building's elegant past.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

This museum of Hawaiian and Polynesian culture is the legacy of the last descendant of the Kamehameha Dynasty.

This WWII plane died a quiet death, and is now a garden eel playground.

The U.S. Navy's last diesel-electric submarine rests half-submerged in the middle of Portland.

Is this the most Portland place ever?

Portland had a unique approach to Cold War-era protections.

World's only nuclear reactor operated by liberal arts undergraduates.

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

Back in 1952, you could get a mushroom cloud chaser with your atomic cocktail.

The best Tiki bar in Las Vegas.

Thousands of artifacts relating to human sexuality, including the world's largest sex bike.