A chilling disappearance (and rescue) of a child uncovers a geological mystery.

This museum collects over a century of automobile history including the iconic car from The Muppet Movie.

This unassuming home was once “grand central station” for the Underground Railroad.

One-layer pyramid in Indiana.

The body of one of the world's most famous outlaws is covered in cement and iron to prevent it from being stolen.

This candy shop has been serving up sweets to the Louisville area since the 1850s.

A 30-year-old Sycamore tree grown from a seed taken to the moon and back.

Ornate limestone building now filled with geologic specimens, and more.

Ruined pieces of stone and a swimming pool are all that remain of an amusement park swept away by a flood.

The first spinning jail built in the United States is the only one that still turns.

The site of a 19th century "dream city" that almost rivaled Chicago before being swallowed by the Indiana sand dunes.

Once adorning a New York skyscraper, these reclaimed ruins now haunt an Indiana park.

If astronomy had a ghost, it would look like this observatory.

A turn-of-the-century architectural marvel built on healing mineral springs and salt licks.

A medical facility that has been kept frozen in time.

A stunning, abandoned limestone quarry in southern Indiana provided the stone to erect the Empire State Building.

The longest navigable underground river in the United States is home to countless blind and albino animals.

The final resting place of the hundreds of bodies originally buried where Badin Lake sits now.

A sign marks the plane crash that caused two nuclear bombs to fall in North Carolina.

The humble gravesite of the man who failed to cash in on his Pepsi-cola goldmine.

The North Carolina grounds are leased in perpetuity to the British Commonwealth for as long as the WWII sailors are buried there.

This 5-by-6-foot wooden hut is the smallest historic post office in the U.S.

A young state senator's deathbed plea to be buried inside a rock resulted in this unusual grave site.

A maritime museum holding the remains of Blackbeard's pirate ship.