Guides by Lonely Planet
Paris' most macabre sight is its underground tunnels lined with skulls and bones. In 1785 it was decided to rectify the hygiene problems of Paris' overflowing cemeteries by exhuming the bones and storing them in disused quarry tunnels and the Catacombes were created in 1810.
After descending 20m (via 130 narrow, dizzying spiral steps) below street level, you follow the dark, subterranean passages to reach the ossuary (2km in all). Exit back up 83 steps onto rue Remy Dumoncel, 14e.