Eons old volcanic activity created one of the most stunning rock formations in the United States.

New fungal and bacterial species call this deadly lake home.

This Old West eatery along America's Loneliest Road was originally a stop on the Pony Express.

Singing sand that stands as the final remains of an ancient lake.

The smallest country in the world.

These once-beautiful historic graveyards are set against the barren Virginia City hills.

This tiny cluster of abandoned buildings looks like the future of the ghost town - today!

Towering basalt columns, a creation of fire and ice.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

Quite simply the largest tree in the world (by volume).

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

A haunting army of decomposing, moss-covered stuffed animals and dolls guard this swinging truss.

For over a century, it was a crucial center of mental health treatment and also the source of many local legends.

Eight "Guardians of Health" protect this art deco water tower from pollutants and bacteria.

This Minnesota town celebrated the state's 100-year anniversary by creating a massive ode to nature's smartest bird.

These crudely shaped folk giants may be the the second most photographed statues in the U.S.

The remains of a World War II munitions factory still haunt the fields of this Twin Cities suburb.

Enter the Forest of the Elves.

20,000 pieces in a Frank Gehry-designed building.

These curious caverns have been home to mushrooms, gangsters, and disco.

The famed architect designed this Minnesota gas station of the future with a lookout tower.

A museum within a museum, devoted to history's most questionable medical devices.

These former Cold War launch sites have been preserved for tourists to see where the button might have been pushed.

Men in rubber-soled boots serve as your "brakes" on this toboggan ride Hemingway described as "exhilarating."