Looking like a mere wall, inside is a secret passage between Vatican City and the Castel Sant'Angelo, where Popes could escape during bad times. Here the picture shows the dome of St. Peters with the Passetto di Borgo heading toward the Castel Sant'Angelo.
Picture of the Passetto, a secret passageway. The Passetto allows passage between Castel Sant'Angelo and the Vatican
By Martha Bakerjian, About.com Guide
Passetto de Borgo Picture: The secret passageway inside links Castel Sant'Angelo to the Vatican.
Picture © 2006 by James Martin - Europe for Visitors, licensed to About.Pictures from the Vatican Museum
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