A castle built by an eccentric medieval enthusiast in rural Ohio.

Former hotel turned into haunted playground.

An Art Deco gem that held together the artistic heart of an agricultural community for 92 years.

Fresh wooden posts have been added to ancient holes to recreate a primitive henge clock.

Man-made geyser that rises to the exact height of the Gateway Arch.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

A notorious Route 66 eatery once frequented by Al Capone.

Oversized statues are just the tip of this nostalgic Americana roadside attraction.

This lagomorph-obsessed Route 66 emporium is home to a giant jackrabbit that sits in a bunny graveyard.

Taxidermy, Cigar Store Indians, A Model of a New York Tenement and Delicious Draft Root Beer.

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

Buy a token from the liquor store and you can make this beast spew flames on command.

A small abandoned and abused cemetery that has become a magnet for ghost hunters.

This grave marks the final resting place of pioneer John Chapman, better known as Johnny Appleseed.

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

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

The lynching and burial site of America's first train robbers.

This mysterious hill seems to pull objects uphill.

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

One man's vision and a labor of love of many.

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

A wartime promise becomes a shrine to Our Lady of Lourdes.

Rare recess caves fill this unbelievably beautiful Ohio park.

This humble star-gazing center touts itself as the "Birthplace of American Astronomy."