The Catacombs and the City That Moved Its Dead Underground

In 1786, Paris had a problem: the Cemetery of the Innocents in Les Halles, which had been burying the city's dead for ten centuries, was so overfull that the ground had risen six feet above street level and the decomposing remains were contaminating the water supply and causing disease. The city's solution was to move the bones — all of them, six million bodies — into the abandoned limestone quarries beneath the Left Bank.

The Catacombs at 1 Avenue du Colonel Henri Rol-Tanguy are the public portion of this ossuary — a mile-long tunnel lined with skulls and femurs arranged in decorative patterns by quarry workers who apparently considered bone arrangement an art form. The tunnels are cool (14 degrees year-round), dark, and 20 meters below street level, and the experience of walking among the organized remains of six million Parisians produces a feeling that no cemetery above ground can replicate.

Practical notes: Book timed entry online weeks in advance — the queue without a reservation can exceed two hours. The tour takes 45 minutes. The tunnels are narrow, the stairs are steep (131 down, 112 up), and the temperature requires a jacket. This is not a haunted house. It is a real ossuary, and the silence of the visitors inside suggests that the distinction is felt.