An enormous park-like oasis, full of famous Chicagoans' graves.

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

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

This bridge is haunted by the ghost of a distraught mother.

Mile-long cave system near Great Smoky Mountains.

An underwater city for the dead.

A mysterious castle built as a monument to lost love.

The world's longest known cave system.

Moonbows over Kentucky.

This elaborate Hindu temple is located in a Chicago suburb, but looks like it was transported directly from India.

Stay in a room with a view... of the bottom of the ocean.

A mysterious monument meant to be a guide into "an Age of Reason" was destroyed after an apparent bombing.