Ancient Rome was followed, from the 4th century on, by Christian Rome. The Christian city was built on top of the ancient city, reusing spaces, buildings and materials. IntegrityThe World Heritage property Historic Centre of Rome, the Properties of the Holy See in that City Enjoying Extraterritorial Rights and San Paolo Fuori le Mura, contains all the essential elements needed to express its Outstanding Universal Value. AuthenticityThe historic city, which has constantly changed throughout the centuries, today has a multifaceted and distinctive image. Specifically, it extends the classification of “historic city” to the whole World Heritage property and to the surrounding areas of the town.