Today the Holy Father visited the parish San Lorenzo fuori le mura, St. Lawrence outside-the-walls. This is a Minor Papal Basilica, rather than a Major, but it is an extremely important church in the history of Rome and our Roman liturgy.
As a deacon I once had the privilege of singing the Gospel from the ancient ambo of this basilica. The mortal remains of Bl. Pius IX are venerated here. The basilica is next to a great and ancient cemetery. It was also here, during WWII that Pius XII came when some bombs had been dropped on Rome. There are famous photos of that moment.