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

A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

This mysterious hill seems to pull objects uphill.

This magnificent Cincinnati graveyard is also a popular public park.

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

A lesser-known part of the Kinsey Institute is this impressive collection of art, artifacts, and material culture related to human sexuality.

An abandoned relic of the city's failed experiment with below ground transit.

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

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

This grave marks the final resting place of a legendary frontiersman... unless it doesn't.

This former tuberculosis research hospital endeavored to cure the dreaded disease with fresh air and positive attitudes.

This 19th century mansion façade adorned with immigrant patriotism is a symbol of Louisville’s history.

Giant novelty guitars now mark the spot where Robert Johnson is said to have sold his soul to the devil.

William Faulkner kept his beloved estate wild and untamed.

This head-spinningly bizarre Depression-era art cave is wall-to-wall quartz and Jesus.

Mass graves and Victorian monuments mark the history of Memphis in this 19th century cemetery.

Walk the whole Mississippi River!

This two-room shotgun shack in Tupelo is the birthplace of a King.

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

148 feet long and in the middle of a verdant forest.

Patrick Dougherty's fantastic living tree sculptures, mind-blowing but temporary.

A once-booming Mississippi River town with a history of racial violence is now eerie and mostly abandoned.

What else would you call a playground hidden in Alabama's oldest and largest cemetery?

River pirates, murderous bandits, and serial killers used this Illinois cave as their debauched hideout.