Limestone grottoes turns everyday objects into stone.

A castle-like sea fort from the 17th century is now a museum to oyster farming.

Home to the "Rat King" of Nantes and other wonders of the natural world.

The great Italian Renaissance painter was laid to rest here in the Chapel of Saint-Hubert.

This church sits upon a peaceful hill and a long, turbulent history.

Despite centuries of architectural innovation, this French castle is being built like it's the 13th century.

This natural French spring has been turned into a magical grotto by Roman and medieval constructions.

Fascinating museum dedicated to the under-appreciated medical history of urology features some wince-inducing devices.

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

A priceless collection of the Nation's cryptologic history.