A unique opportunity to stay the night in retrofitted sections of sewer pipe.

The largest ice cave in the world is thought to be the entrance to hell according to Austrian legend.

A surreal, Gaudi-inspired play space near an Anaheim community center.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

Walk upon the mementos of the dead in this Parisian courtyard paved with medieval tombstones.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

A lone cannonball remains lodged in the walls of the Hotel de Sens as a sober reminder of a revolution.

A Parisian exterminator's shop whose storefront displays stuffed rats hanging from traps.

Dolls of all shapes and sizes display the eras of femininity in this spooky and beautiful collection.

Filled with goldfish swimming in a shallow pool of sea water, this ancient crypt is more wishing well than burial site.

As can be expected from a centuries old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

A 16th-century horror show built in a lovely Italian garden.

Hidden in an Italian forest is a completely homemade amusement park that has taken a lifetime to create.

A hidden garden of stones engraved with scriptures, a Joseph Smith Sphinx, all carved by one man.

The world's first ice hotel is still one of the most elaborate and beautiful.

Groups of prehistoric tombs that dot the mountains of northern Oman.