A burial ground is a place where the dead are laid to rest. Catacombs, necropolises, churchyards, cemeteries and graveyards are all types of burial grounds. Catacombs are underground tunnels or chambers used for burial, while necropolises are large, ancient burial grounds. Churchyards are burial grounds associated with churches, while cemeteries are more modern burial grounds. Graveyards are smaller burial grounds, usually located in rural areas.