Catacombs (not for the weak!)

At the end of the 18th century, the government began converting several subterranean rooms into mass graves. This was necessary to meet desperate overcrowding in the medieval cemeteries in the center of Paris, which also became a hygienic problem. From 1785 to 1786, in 15 months, millions of bones and rotting corpses were tranported from the unsanitary city cemetery in Les Halles to this place. It was a monumental project to transport the bones in huge carts at night across the city.
And here they are, in huge piles, arranged as crosses, as faces and in other different configurations. Above the door outside are the words (in French): Stop! This is the empire of death. This bone collection of 5 to 6 million people has 11,000m².

Yes, what you see is piles of bones. Millions of bones. This was actually Kelsey and the kids' favorite thing we saw while we were in Paris. Honestly, it was a little too much for me!