You should check the photos of Pius XII stuff my friend John Sonnen has posted on his site Orbis Catholicus. He always has interesting photos.
San Pancrazio is up on the Gianicolo, next to the entrance to the Teresianum. It is, if memory serves, the last of the Roman Stations after Easter, for Dominica in albis. There are also catacombs there, but they are hard to visit.