#4 The Catacombs Of Paris, France
If you’re looking for a place that will make your blood freeze, the Catacombs of Paris might be just the spot. The catacombs are a vast underground ossuary that holds the remains of 6 million people, created to fix the problem of Paris’ overflowing cemeteries. As you walk through the catacombs, you’ll see a sign that reads “Arrête! C’est ici l’empire de la Mort” (“Stop! This is the empire of Death”).