Ten meters beneath the Vatican basilica, it is possible to walk the same path that led to the tomb of the apostle, among rows of Roman tombs that have emerged, intact, from the excavations. The latest restoration was presented just a few days ago. A marvel of art, history, faith.
Sandro Magister has a fascinating article on the excavations. Constantine buried a pagan necropolis in order to level the approach to the Apostles tomb, Pius XII sent in the archaeologists.