The coldest city in the world.

The giant Siberian crater known locally as the "doorway to the underworld" is expanding every year.

The secluded site of a 1943 plane crash and amazing rescue is only accessible by hiking through the woods.

At the time of its completion, it was the tallest dam in the world.

One man's ambition created this psychedelic log home.

The largest man-made crater in the U.S. marks the spot where we once tested mining with nukes.

A picture-perfect town, perfect for blowing up.

One of the few remaining indigenous petroglyph sites in Nevada.

The farthest you can be in the contiguous U.S. from a McDonald's location.

These huge stone ovens in the desert fueled the Nevada silver boom, and may have also been a hideout for outlaws.

This crumbling stump is all that remains of what was once thought to be the oldest living organism.

A gothic palace of endless stalagmites and pseudoscorpions waits within one of the world's most beautiful caves.

The simple log cabin of a famed loner and naturalist stands preserved as a symbol of the ultimate DIY lifestyle.

Massive mounds of golden sand look like a desert landscape randomly plopped in an Arctic forest.

This abandoned Antarctic research station is a Soviet ghost frozen in time.

Two World War II aircraft lie within the jungle around this abandoned runway.

A surprisingly beautiful abandoned World War II military base in East Greenland.

This collection of unique liquids allows visitors to wander the waters of Iceland's glaciers.

A fantastic reconstruction of a 10th-century Viking longhouse.

This former farm In northern Iceland is now a museum, where visitors can tour beautifully-preserved turf houses.

A little-visited waterfall in an otherworldly landscape.

This modern monument to pagan belief looks like it was transported straight from ancient times.

This canyon is comprised of gorgeous waters and magnificent basalt columns.

This replica Viking village was created for a film that was never shot and is now open to visitors.