This lush forest valley was once mined for lumber to the extent that it was once nicknamed "The Pennsylvania Desert."

A grandiose title could not save this mercantile community from obscurity.

One of the steepest streets in the United States makes an intriguing challenge for cyclists.

Metal sculpture folk art lining the Kansas Highway.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

Home to the deepest rift anywhere on Earth.

Mysterious glowing orbs float through the desert night.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

The world's tallest statue of an American hero.

Crumbling hotel echoes with the sounds of the '30s.

Once connected to the outside world by a single train track, this ghost town is looked after by the National Park Service.

A beautiful geyser under environmental threat.

Population: 1.

The largest earthwork effigy in the world.

An office built to look like a giant basket.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

Deep scars on the earth left by the Ice Age.

This massive redwood tree has a hole in the base big enough to drive through.

The world's longest known cave system.

Electrical pylon in the shape of Disney's beloved mouse.

A monument to the center of the North American continent may be off by a few miles.

The final resting place of New Orleans' most famous voodoo priestess.