The Catacombs of Domitilla consist of over 15 kilomitres of underground caves and are the oldest underground burial network in Rome. They consist of four levels of underground caves, some of which are inaccessible. In addition to this, the Catacombs of Domitilla are the oldest of the catacombs and the only catabombs that still contain bones as of today. This is because the catacombs are extremely well preserved.
The Catacombs of Domitilla were named after Saint Domitilla and are the most extensive of all of the catacombs in Rome. To illustrate just how large they are, there are almost an incredible 150,000 bodies that were buried within the catacombs. The Catacombs of Domitilla contain valueable artifacts such as a second-century fresco of the Last Supper, among others.
Even the entrance to the catacombs is impressive; to enter, one walks through a sunken fourth-century church. This church (or basilica) was deemed unsafe at one point, and was thus abandoned sometime in the 9th century. It was later rediscovered in 1593, and in 1872, big parts of it was reconstructed.
The Catacombs of St. Domitilla are located near the Catacombs of St. Callixtus as well as the Catacombs of San Sebastiano, both of which are excellent places to visit during your stay in the ancient city of Rome.