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.

On at least two occasions it served as an escape route for Popes in danger. Pope Alexander VI crossed it in 1494, when Charles VIII invaded the city and the pope's life was in peril. Clement VII escaped to safety through this passage during the Sack of Rome in 1527, when troops of the Holy Roman Emperor, Charles V, massacred almost the entire Swiss Guard on the steps of St Peter's Basilica.

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41°54′12″N 12°27′42″E / 41.90333°N 12.46167°E / 41.90333; 12.46167