The Catacombs are a 1.5 km one-way walk through old limestone quarry tunnels 20 meters under the city. The bones of several million Parisians, moved from old cemeteries, line the walls in stacked patterns of skulls and bones. Carved plaques mark the streets overhead.
It suits curious older kids who like history. Younger or anxious children may find the dim, narrow passages and the bones too much.
