Skip the Line: Crypts and Roman Catacombs Small-Group Walking Tour. Go underground to see Rome’s ancient catacombs and crypts on a 3.5-hour walking tour. Visit the Domitilla Catacomb and Basilica of San Clemente with skip-the-line access, plus visit the Capuchin Crypt, where you’ll see a Caravaggio painting and marvel at a chapel made entirely out of human bones. Learn about past burial customs and secret Christian worship spots during this fascinating exploration into the history of Rome. Book with us and Save 10%! Skip the Line: Crypts and Roman Catacombs Small-Group Walking Tour.