Around the 17th and 18th centuries, the residents of the overflowing cemeteries of Paris were moved to the limestone quarries underground, creating a giant ossuary for over six million skeletons. It's now a tourist attraction.

This is just about the creepiest place I've ever been to.

Around the 17th and 18th centuries, the residents of the overflowing cemeteries of Paris were moved to the limestone quarries underground, creating a giant ossuary for over six million skeletons. It's now a tourist attraction.

This is just about the creepiest place I've ever been to.