Les Catacombes de Paris
- Admission: 5 Euros
When a handful of city cemeteries were closed in the 18th and 19th centuries because they were overflowing and posed a threat to public health, the bodies of more than six million Parisians were relocated to a former quarry below the city. What’s even gnarlier is that bones and skulls were used to create its walls. You can tour the labrynth-like ossuary—and theoretically visit the remains of notables like Rabelais and Robespierre—but this is not for the claustrophic, and probably not for kids.