Embark on a fascinating journey through the Basilica of San Giovanni in Laterano with an informative audio guide. Uncover the hidden history of this iconic site and explore the cloister and Treasury Museum. Ascend the 28 marble steps of the Scala Santa (Holy Staircase) to reach the papal chapel of the Sancta Sanctorum. Your ticket also grants you access to the Catacombs of San Callisto, an underground cemetery constructed by early Christian communities in the 2nd century AD. Join a local guide and delve into the unique architectural design of these underground galleries, ingeniously crafted to address spatial constraints.