Les Catacombes ossuary in Paris is renowned for its gruesome and ghostly atmosphere, yet continues to captivate visitors. The history of these underground tunnels dates back to 1785, when they were used to store the exhumed bones of corpses from overcrowded cemeteries. Prior to opening to the public in 1809, the ossuary underwent a decorative restoration. It is estimated that the remains of millions of anonymous Parisians are now housed within the Catacombes. The significance of these tunnels in Parisian history goes beyond their role as an ossuary. During WWII, the Resistance held clandestine meetings in the tunnels, and to this day, nighttime explorers known as cataphiles illegally traverse the tunnels.