Steep canyon walls hide a forested oasis in the West Texas desert.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

One of the oldest active carousels in the country—but it might be missed by all but the keenest-eyed boardwalk strollers.

In the power of this waterfall, Alexander Hamilton saw the potential for industry.

One of the most enjoyable bits of history at Coney Island and “the most romantic ride in the world.”

The land is home to swimming ponies and a legendary 18th-century treasure.

This advertisement for talcum powder was painted on the rock face and has since defied removal.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

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

An abandoned coal mine reached by a steep hike.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

Hikers can still stroll beneath the long conveyer of this abandoned mining facility hidden in a West Virginia river gorge.

A historic lighthouse steeped in rumors of ghost and pirate stories.

This Moab institution functions as both a rock store and a small natural history museum.

The largest island on the great salt lake is home to curious creatures and strange stories.

Derelict buildings are all that remain of a complex at the site of one of the worst mining disasters in Montana history.

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

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A beautiful geyser under environmental threat.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

This rustic old building is said to be the most photographed barn in America.

Home to the deepest rift anywhere on Earth.

This giant meditative chakra sits peacefully in the Flathead Valley of western Montana.