Contrary to what one might expect, ice forms inside this small cavern during the summer and melts during the winter.

Frank Lloyd Wright’s most iconic home dangles over a Pennsylvania waterfall.

A toxic ghost town sitting atop a massive coal fire.

Profile of a sleeping person four kilometers long in 250-meter-high cliffs.

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

A historic coal mine that doubles as a museum and tourist attraction.

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

The "mysteries" of this quintessential roadside oddity were almost destroyed by neglect but were saved by fans of kitschy wonder.

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

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

A miniature world of concrete and stone in Springfield, Ohio.

The largest ancient burial mound in Ohio.

A real flying saucer, contracted by the U.S. Air Force.

This stuffed pigeon of war had the very serious name "John Silver" until he lost a leg in battle.

Prison made famous by The Shawshank Redemption has been out of commission since 1990.

The permanent home of Elektro, the celebrity automaton of the 1939 World's Fair.

Soaring over the Niagara Whirlpool since 1916.

One of many reminders of Tesla's scientific contributions overlooks the falls which inspired him.

The home made famous by the 1983 holiday classic is now a perfectly preserved shrine to the movie.

The only presidential monument to display a late POTUS's actual casket.

This collection honors the iconic, and proudly American lighter that just won't quit.

A collection of unique outdoor sculptures surounded by the beauty of nature.

Town full of spiritualists, some of whom are mediums, is still in full swing after 130 years.

"Where the ducks walk on fish."