Mines of Paris

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The mines of Paris (French: carrières de Paris – "quarries of Paris") comprise a number of abandoned, subterranean mines under Paris, France, connected together by galleries. Three main networks exist; the largest, known as the grand réseau sud ("large south network"), lies under the 5th, 6th, 14th and 15th arrondissements, a second under the 13th arrondissement, and a third under the 16th, though other minor networks are found under the 12th, 14th and 16th for instance. The commercial product was Lutetian limestone for use as a building material, as well as gypsum for use in "plaster of Paris".

Exploring the mines is prohibited by the prefecture and penalised with large fines.^{[citation needed]} Despite restrictions, Paris's former mines are frequently toured by urban explorers known popularly as cataphiles.

A limited part of the network—1.7 kilometres (1.1 mi) in length—has been used as an underground ossuary, known as the catacombs of Paris, some of which can be toured legally. The catacombs were temporarily closed between September and 19 December 2009 due to vandalism,^[1] after which they could be legally visited again from the entrance on Place Denfert-Rochereau. The entire subterranean network is colloquially referred to as "The Catacombs".