When the overcrowded cemeteries of 18th century Paris began to fester with disease and illness, the French came up with a rather unique solution. Enter the Catacombs. One of the the city's more provocative and macabre attractions, this series of winding quarries-turned-crypts hold the displaced remains of some 6 million former Parisians. Far from being a dark and unsanitary deposit of human cadavers, however, the intricate layout of skulls and other pseudo-identifiable bones (mainly femurs) that compose this labyrinthine arrangement of tunnels makes for a uniquely memorable cultural adventure. Just be sure to choose your visiting hours wisely (think 10 am opening time), as long waits in line tend to mar the experience.
Location:1, avenue du Colonel Henri Rol-Tanguy, Paris
Note:Closed on Mondays.