The world's longest known cave system.

An abandoned theme park with a strange and tumultuous past.

An ode to "The Queen of Appalachia."

A recreation of the doomed ocean liner in the middle of the Smoky Mountains.

This 19th-century building inadvertently preserved the handprints of its builders within its walls.

An abandoned town is hidden in Great Smoky Mountains National Park.

This high point in the Great Smoky Mountains is said to be home to the chief of all bears.

Some North Carolina Cherokee have been keeping their history alive for decades with a single play.

In West Virginia, you can walk across the longest single-arch bridge in the Western Hemisphere.

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

This 25-foot-tall statue was built as a protest to a property dispute.

A colossal concrete penguin announces this Montana town as the coldest spot in America. But is it really?

The only road through the heart of Glacier National Park.

Spectacular views await visitors to this lake.

A beautiful geyser under environmental threat.

An architect's childhood fantasy treehouse made real.

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

A 6-mile-long lake created by an apocalyptic seismic event and the deadly chain reaction that ensued.

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

This 35-foot troll in Jackson Hole, Wyoming, was made by the world’s leading recycling artist as part of a global fairytale.

Just a man taking his prehistoric pet for a stroll.

A striking sculpture built to honor the women of the Lakota and Dakota Nations.

Honoring the star of the “The Bob Newhart Show” which took place in the city of Chicago in the 1970s.