Is Paris Catacombs haunted?
France Reported haunting level 5 of 5
What actually happened
Beginning in 1785, authorities transferred human remains from overflowing Paris cemeteries into former quarries; the ossuary contains the remains of several million people.
The history
The underground site was consecrated as the Paris Municipal Ossuary in 1786 and opened to visitors by appointment in 1809.
What people report
The scale of the ossuary, its restricted tunnels and reports from illegal explorers have produced stories of voices and figures in the dark.
That paragraph is reported tradition, not a claim about what is there. The history above it is sourced; the stories are recorded because people tell them.
Visiting
1 Avenue du Colonel Henri Rol-Tanguy, 75014 Paris, France