In 1786 real estate was scarce in Paris, and overcrowded cemetries were too valuable to leave to the dead. The government decided reclaim the land by moving the bones to the empty underground limestone quarries at the edge of the city. By 1860, 5 to 6 million skeletons had been moved and arranged into mounds and macabre designs.
An unassuming black door opposite Denfert-Rochereau Metro station takes you to the underground passages.
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