If you’re intending to visit only one of the catacombs of Rome, the Callixtus catacomb is a perfect choice because they are among the most significant and biggest in the city. Notwithstanding dozens of martyrs, sixteen popes are covered here. The tunnels are amazingly impressive – they stretch for a significant distance and are up to 70 feet high in some parts. These catacombs contain a region devoted to the popes nicknamed "the little Vatican". Nine popes were covered here, and you can still see the first Greek inscriptions close to the tombs. There are some reminiscent Christian frescoes containing conventional symbols such as the fish, the pigeon and the phoenix. Some of the most significant artworks are situated in a small gathering of chambers which were once family tombs. Albeit the remains of St Cecilia are not, at this point here, you can see the grave where she was once covered. Most catacombs open to the general population are situated on the Appian Way (Via Appia Antica). It's somewhat way out of the middle, yet while in Ancient Roman times it was considered to be outside of Rome, these days it's especially essential for the city.