The catacombs—underground tunnel systems lined with recesses for bodies—of Rome date to about the 1st century and were built due to land shortages and because persecuted Christians needed a place to bury their dead. Early Christians also took refuge and occasionally worshipped in the tunnels. Thus they are unique in their abundance of Early Christian artwork and iconography. Forgotten for centuries, the catacombs were accidently rediscovered in 1578. Why is Rome uniquely suited for such tunnels? Discuss
Source: The Free Dictionary