A perspective on the importance of Catholic Christianity, intertwined in Rome's history, arcaic traditions and culture. Without leaving out the artistic and architectural aspect. Historical changes and art are often found in the oldest Roman churches. Like in Basilica di San Clemente, the only church in Rome, built on three different levels; the Basilica of Saint John Lateran and The “Scala Santa” (Holy Stairs); the Basilica of the Holy Cross in Jerusalem, one of the Seven Pilgrim Churches of Rome and the Basilica di Santa Maria Maggiore