You thought Santa Claus didn't exist, but it turns out you were wrong.

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

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

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

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

A medical facility that has been kept frozen in time.

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