Step into the gruesome history of Rome as you explore the ancient catacombs where martyrs St Marcellinus and St Peter were slain in the persecution of 304 AC. Witness the underground graveyard, spanning three levels and excavated between the 3rd and 5th centuries AD. Discover the final resting place of roughly 20,000 to 25,000 people, including numerous martyrs of the persecution of Diocletian. Explore the 18,000 square meters of catacombs and marvel at the tombstones covering the niches, known as loculi. Uncover early Christian inscriptions on the marble tombstones, offering a fascinating glimpse into the history of Rome.