Thanks to its heroic service during WWII this Soviet castle has been turned into a monument towered over by a brutalist titan.

A unique opportunity to stay the night in retrofitted sections of sewer pipe.

The shell of a medieval fortress offers commanding views of the area it once protected.

American soldiers discovered Europe's best one-liner at the end of World War II.

"World machine" built by an untrained Austrian farmer.

The world's largest collection of intentionally useless inventions.

Where beer lovers can literally immerse themselves in beer.

Some of the smallest works of art in existence.

An Albanian monument to the Communism that nearly crushed the country is now a crumbling wreck.

A medieval bridge stretches over a sulfur-rich river that leads to year-round natural hot springs.

A naturally beautiful, seemingly bottomless deep blue spring.

In La Paz's huge, city-sized cemetery, the deceased are stored in rows of apartment-like buildings.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

On Japan's Tashirojima Island, cats are king.

A part of the world's largest marsh seems to be growing bright red Martian grass.

A faux desert landscape in the middle of the jungle that sprouts oases during the rainy season.

Northern Ireland's Brobdingnagian stepping stones.

The atmospheric road was never meant to be so creepy.

Roman ruins top white travertine terraces formed by ancient hot springs.

The world's widest single drop waterfall, and the two men who legend says went over its edge in a boat.

This "floating island" plateau sits 7,671 feet above the forest floor.

A stray meteor left this picturesque hole in the Australian outback.

Twice a day a speeding train passes only inches from the homes of this residential neighborhood.

A series of waterfalls so massive they straddle the border of Argentina and Brazil.