Rome's San Callisto catacombs housed early Christian heroes later recognized as martyrs and saints as early as the 3rd century. Along with the catacombs, which were abandoned and forgotten in the Middle Ages, Rome's ancient Appian Way is enjoying resurgence as a well-known attraction for locals and tourists alike. For more information on the Rick Steves' Europe TV series — including episode descriptions, scripts, participating stations, travel information on destinations and more — visit www.ricksteves.com.