10% off on Underground Rome Catacombs Tour. Discover Rome’s ancient, subterranean, Christian burial places on an Underground Rome Catacombs Tour! With your Underground Rome Catacombs Tour tickets, you’ll uncover the many Christian catacombs located beneath the city of Rome. Unlike the pagans who cremated their dead, the followers of the new religion, Christianity, required burial upon their deaths. And, as a result, there are about 40 Christian catacombs, as well as six known Jewish catacombs in Rome.