Ancient cave tombs known as the "houses of fairies."

This elaborate hole in the ground was built as a sacred site for an ancient civilization.

Windblown rock formations in an ancient Roman quarry.

Stalactites and stalagmites in a beautifully lit cave.

This Japanese-inspired labyrinth of hot springs is hidden in a Chilean forest.

In the most arid desert on the planet, the world's leading telescope allows astronomers to see more than has ever been seen before.

What was once a unique system of urban elevators is turning into a mechanical ruin.

This abandoned Antarctic base sits nearly unchanged since it was forsaken in the 1950s, just waiting for you to visit.

An abandoned whaling station on an active volcano offers hot springs in Antarctica, surrounded by ruined giants of industry.

This Portuguese bullring is built right into the caldera of an island volcano.

This abandoned five-star hotel is now a five-star urban exploration destination.

As the highest point in the Mid-Atlantic range this stratovolcano offers spectacular views.

Every fall this lake mysteriously drains, like a bathtub with the plug pulled out.

A mysterious taxidermy man-beast of the seven seas.

Hoodoos, naturally eroded land formations, stand 20 feet tall in the Canadian badlands.

The world's largest and most outstanding marl lake regularly changes color.

Watch out for the two-story Godzilla made out of tires.

A fascinating little museum dedicated to the thousands of chemical substances concealed in our food.

A varied collection of brains in alcohol.

Enter the cabin of a life-sized Hindenburg replica.

Ruins of a German Castle on top of a towering stone pillar.

This Austrian museum celebrates the work of famous forgers and their inimitable imitations.

Macabre museum devoted to historical Viennese murders.

Handsomely crafted representations of our round planet.