what are catacombs?

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The catacombs wee underground tombs near Rome where the early Christians were buried.Thers tombs were cut in soft rock in a holy area surrounding the city of Rome. When Emperor Nero began to treat the Christians cruelly,they gathered in the tombs to pray.This was because every citizen was safe from harm in the burial grounds.Later,by the middle of the third century,even the burial grounds became unsafe.