Rome: Hop-on Hop-off Bus, Travel Card, & Guided Tour of St. Callixtus Catacombs

See the Colosseum, St. Peter's Basilica, the Spanish Steps and more on the hop-on hop-off bus. Stop when you like, where you like – or stay for the fully narrated tour. You can also use all public transport with your travel card! Then, at your leisure, get underground at the St. Callixtus Catacombs, the largest of Rome's catacombs. As the official cemetery of the newly established Roman Church, archaeologists have discovered the tombs of 16 popes, dozens of martyrs, and thousands of others.