Dug between the 2nd and 5th centuries, this network of creepy tunnels was known as the Queen of Catacombs. It was an important early Christian burial site and numerous martyrs and popes were buried in the tombs and chambers that line the 13km of tunnels.
Visits take in a decorated Greek chapel and a scratchy fresco of the Virgin Mary. Dating to around 230 AD, this is thought to be the oldest ever image of the Madonna.
