Why did they even built it
>Went there 2spoopy4me.jpg shit myself so I skipped the tour.
Bump
Paris is built over a bunch of ancient limestone mines dating back to the Roman period. In the late 1700s they had two problems: the ancient mines kept caving in, and the city cemeteries were full. Solution: renovate the mines and then fill them with the bones from the cemeteries.
Imagine LARPing, but it's real