Answer: catacombs

AnswerCrossword Clue
CATACOMBSSubterranean galleries.
CATACOMBSChristian hideout
CATACOMBSAbout 600 miles of underground passages near Rome
CATACOMBSTunneled site
CATACOMBSAncient shrines
CATACOMBSMaze full of dead ends?
CATACOMBSUnderground burial places
CATACOMBSEarly cemeteries
catacombsAn underground construction resembling or compared to such a cemetery
catacombsCATACOMB, an underground cemetery
catacombsAn underground cemetery consisting of a subterranean gallery with recesses for tombs, as constructed by the ancient Romans