“After the war, the cult of the catacombs began to grow. Increasing numbers of people were drawn down into them for purposes of concealment, crime, or pleasure. These users of the network became known as “cataphiles”—“lovers of the below.” In 1955, access to the catacomb network was made illegal, with the exception of a small area of show ossuaries that were kept open for purposes of tourism.” The Invisible City Beneath Paris https://www.newyorker.com/news/dispatch/the-invisible-city-beneath-paris