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

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

A late sculptor's last project was to turn this abandoned cement factory into a castle-themed amusement park.

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

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

Quirky water tower advertises the long-gone Brooks Tomato Products Co.

Less a museum than a bizarre fantasy world created by artists and engineers.

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

The world's largest anatomically accurate brain sculpture.

One-layer pyramid in Indiana.

The world's longest known cave system.

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

A small storefront museum explores the history and myth of West Virginia's famous urban legend.

This red-eyed chrome beast pays homage to the popular modern myth of West Virginia's insectoid monster.

The largest ancient burial mound in Ohio.

The inventor of a number of hybrid corn species is immortalized with a field of giant corn.

The only remnant of a small mining town is an abandoned railroad tunnel that is steeped in ghostly lore.

This modern castle sat empty for decades before a fire inspired its builders to complete its luxury halls.

Rabbit Hash is a heaping slice of Americana from another era, with a very peculiar origin behind its unusual name.

A 70,000-square-foot institution dedicated to a very literal, creationist perspective on the Book of Genesis.

After a water tower painting was accused of being an ad, a simple fix was made that gave the city a motto.

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

This magnificent Cincinnati graveyard is also a popular public park.

Inside, ancient treasures. Outside, modern contradictions.