Catacombs of Paris in a 20 x 30 Poster
The Catacombs of Paris (French: Catacombes de Paris, About this soundpronunciation ) are underground ossuaries in Paris, France, which hold the remains of more than six million people in a small part of a tunnel network built to consolidate Paris' ancient stone quarries. Extending south from the Barrière d'Enfer ("Gate of Hell") former city gate, this ossuary was created as part of the effort to eliminate the city's overflowing cemeteries. Preparation work began not long after a 1774 series of gruesome Saint Innocents-cemetery-quarter basement wall collapses added a sense of urgency to the cemetery-eliminating measure, and from 1786, nightly processions of covered wagons transferred remains from most of Paris' cemeteries to a mine shaft opened near the Rue de la Tombe-Issoire.
to learn more about the Catacombs under Paris https://en.wikipedia.org/wiki/Catacombs_of_Paris