Where beautiful signs live on forever.

Lions and tigers and leopards, servals, pumas, bobcats, lynxes, and ocelots... oh my!

The only freestanding table rock formation east of the Mississippi.

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

Modeled after the labyrinth in Chartres Cathedral, this small-town Indiana memorial labyrinth sits half a world away.

This hidden stream beneath Indianapolis makes an appearance in the best-selling novel "Underground Airlines."

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

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

This mysterious hill seems to pull objects uphill.

Symbolic attempt to overcome the issues of life.

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

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

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

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.

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

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

An enormous natural sandstone bridge in Kentucky.

A humble homemade ride attracts visitors from around the globe to this small Midwestern town.

While there are no actual snakes in the history of this crooked road, there may be a number of dead horses.

This open air cathedral invites all faiths to worship under the only roof big enough to fit them all: the sky.

Part of a worldwide art project, this mysterious semicircle of concrete shapes holds the pieces of a larger story.

Planes, trains, and automobiles have all been sunk as attractions at this Illinois diving spot.

Even with only two residents and one building, this tiny Illinois town is famous for its burgers.