Route of the "Passetto" from the Vatican (in the background) to Castel Sant'Angelo.The southern side of the "Passetto" seen from the Borgo S. Angelo.The Passetto in its original context: in background the rear side of Palazzo Rusticucci-Accoramboni seen from Vicolo del Farinone, before the demolition of the neighborhood (c. 1930)Over the Passetto, going towards the Vatican.
The Passetto di Borgo, or simply Passetto, is an elevated passage that links the Vatican City with the Castel Sant'Angelo. It is an approximately 800-metre-long (2,600 ft) corridor, located in the rione of Borgo. It was erected in 1277 by Pope Nicholas III, but parts of the wall were built by Totila during the Gothic War.