Basilica di San Pietro which is built on the tomb of St. Petros was known to the world as the center of Roman Catholic. It is famous for Michelangelo's art such as the wall painting of Sistina chapel and the pieta.The symbol of the key into heaven which St.Petros grasps standing at the entrance.
I am a debtor both to Greeks and to barbarians, both to wise and to unwise. So, as much as is in me, I am ready to preach the gospel to you who are in Rome also. For I am not ashamed of the gospel of Christ, for it is the power of God to salvation for everyone who believes, for the Jew first and also for the Greek. (Romans 1:14-16)