1) Ancient shrines 2) Burial chambers 3) Early cemeteries 4) Maze full of dead ends 5) Rooms full of Roman remains 6) Tunneled site 7) Underground burial places 1) Tombs 
Catacombs are human-made subterranean passageways for religious practice. Any chamber used as a burial place is a catacomb, although the word is most commonly associated with the Roman Empire. Many are under cities and have been popularized by stories of their use as war refuges, smugglers` hideouts, or meeting places for cults. ==Etymology== The....
(of Paris) 280km of disused quarries under Paris that are colloquially known as the Paris catacombs or catas.