Cathedral Basilica of Sts. Peter and Paul, Philadelphia. One of my favorite places in Philly. The rotunda inscription above the tabernacle reads "You are Peter, and upon this rock, I will build my Church." (Matt 16:18). A note to visitors: the Basilica has tours! But please keep your voice down. The Basilica is not a museum, but an active Catholic church. People still go there to pray. Jesus is also Truly Present (you may not believe it, but Catholics do. Please respect that).