Les Catacombes, Paris

In 1810, the Montrouge stone quarries became catacombs. Because of a lack of space in the graveyards of Paris, it is here, 20 meters (65 feet) underground, that the remains of six million Parisians are exhibited. These ossuaries, illustrated by texts, create a chilling atmosphere and describe some of the events in the history of Paris, giving visitors substance for meditation. During World War II, this network of galleries was used as a hideaway for the Résistance movement; its vastness and the discretion of its entrances were great assets indeed. Today, these subterranean passages allow visitors to explore the true underground of Paris; a must-visit!