A church of bones, decorated with 40,000 human skeletons.

A Lovecraftian altar of nightmarish bronze chairs sits ominously on a boardwalk in Puerto Vallarta.

A beloved Chicago music venue offering cold beer and lots of “Friendly."

An underground city of salt.

At first glance, this area seems like just another city park, but the lush landscape hides a dark past.

A collection of modern and vintage pinball machines housed in the cellar of a 15th-century building.

A relatively obscure antihero from the Marvel Comics universe adorns a wall inside Iceland's main airport.

When a supermarket opened up shop within a medieval building it became protected by UNESCO on a technicality.

The big toe of this towering monument to a Croatian national hero is worn from years of superstitious rubbing.

A wonderfully strange collection of 500+ stuffed frogs doing people things.

Labor provided by Great Depression-era programs restored these 25,000 acres in Tennessee.

A bizarre roadside attraction and the first instance of miniature golf in the world.

This structure among the trees was the result of divine inspiration.

Prehistoric animals decorate this popular outdoor park.

The world's longest known cave system.

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

The very first subway station in New York City is beautiful, decked out in chandeliers, and ... abandoned?

Tucked in the back of this amazing antique store is an important piece of medical history.

A semi-scholarly approach to sex.

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

A Museum of Holography frozen in 1974.

A monument to the art of slicing people open.

Theater has had many different incarnations but has survived the ravages of time.

Odd, decrepit fountain honors Chicago author who had mixed feelings about his hometown.