In Paris' Roman era, its main cemetery was located to the outskirts of the Left Bank settlement, but this changed with the rise of Catholicism, where most every inner-city church had adjoining burial grounds for use by their parishes. With Paris' growth many of these, particularly the city's largest cemetery, les Innocents, were filled to overflowing, creating quite unsanitary conditions for the capital. When inner-city burials were condemned from 1786, the contents of all Paris' parish cemeteries were transferred to a renovated section of Paris' stone mines outside the "Porte d'Enfer" city gate, today place Denfert-Rochereau in the 14th arrondissement. The process of moving bones from Cimetière des Innocents to the catacombs took place between 1786 and 1814; part of the network of tunnels and remains can be visited today on the official tour of the catacombs.

What is Paris' largest cemetary?