This wooded grove of beautiful hand-built stone grottos is a hidden gem within a shuttered Franciscan monastery.

Erosion and time have created a naturally-formed water park.

European castle ruins in an American state park are actually the product of death and grief.

Destroyed by flood waters, prison now serves as a training ground for armed forces.

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

A collection of human remains, animal body parts, and other macabre curiosities all legally for sale.

A book collector's dream, this Toronto bookstore has the world's first "Biblio-Mat," a random book vending machine.

A collection of more than 12,000 shoes, displayed in a building shaped like a shoebox.

A museum in rural Utah documents the history of the Japanese Americans who were forcibly relocated there.

A small flooded ghost town with a few scattered structures remaining.

Bits and pieces from the ill-fated Donner Party's winter cabins.

An abandoned cyanide mill is now a haunting magnet for graffiti and illegal parties.

Offering commanding views of the California coastline, this restaurant was a hub for the artists and bohemians of Big Sur.

The Sighignola summit on the Swiss border offers views so breathtaking it's been named one of the most beautiful places in Italy.