30 Of The Most Terrifyingly Creepy Places From Around The World - The Catacombs in Paris - The network of underground pathways beneath the streets of Paris contain the remains of over 6 million bodies.
Catacombs of St Callisto, the official cemetery for the Christians of Rome. Sited along the Appian way, these catacombs were built after AD with some private Christian hypogea and a funeral area directly dependent on the Catholic Church.
The Catacombs, Rome, Italy. Durring the persucution of the early church, the Church hid down in the city's burial cite. Authorities were afraid to go down and get them and the ones brave enough couldn't find the Christians.