The summer home of the largest colony of bats in the world.

A recreated Stonehenge stands in a country field, complete with Easter Island moai heads standing as sentries.

This strategically-placed fountain creates the magnificent illusion of mustangs galloping across a river.

A "Texanic" (gigantic Texas) collection of Art Deco architecture at Dallas' historic Fair Park.

A modernist landscape of water and sci-fi concrete.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

The ruins of an important pilgrimage destination for worshippers of a Maya fertility goddess.

Divers can encounter an abandoned warship encircled by a giant kraken submerged in the British Virgin Islands.

This huge pile of volcanic boulders hides a stunning network of secret grottoes.

A mountain of conch shells created by centuries of fishermen.

A piece of John the Baptist in the American heartland.

Four, 18-foot-tall badminton shuttlecocks lie scattered about the lawn of a Kansas City museum.

The oldest university museum west of the Mississippi retains its 19th century feel.

Statue dedicated to the star of an old television show.

A giant, Gilded Age mansion that once belonged to the beer baron of Milwaukee.

No one knows how many bodies are in this vault in a Chicago public park.

To find the "unicorns of the deep" you've got to go downstairs.

This awkward aquarium sculpture is one of the strangest statues in Chicago.

These pretty kitties killed and ate as many as 135 railway workers.

A little-known subterranean street runs under some of the best-known buildings in Chicago's River North.

This alley in downtown Chicago held the bodies of over 600 people after the fateful Iroquois Theatre fire.

A haunting statue called "Eternal Silence" has quite the reputation among visitors with active imaginations.

One of the longest water bridges in the world was built over a supposedly haunted swamp in Louisiana.

After the oysters have been shucked, and the restaurant's been shuttered, the terrazzo sidewalk from the 1940s is all that remains.