In 1785, they chose old quarries of Tombe-Issoire, in the Montsouris' plain, to be the future Parisian underground ossuary. Guillaumot, the quarries general inspector, was in charge of the landscaping. What a mess! They had to evacuate bones from the old Innocents' cemetery: here, corpses from more than 20 parishes used to pile up since centuries!
Add to this corpses remains from 16 Parisian cemeteries closed between 1792 and 1814... We count in the Catacombes, about 6 millions people, whose bones rest on 11 000 square metres, 20 metres deep, in a place which was named after Rome's old catacombs. Bones are put away along galleries: the wall reaches 30 metres thick! Transfers lasted from April 1786 to January 1788. And in 1810, bones became Parisians' favourite attraction!