Hadrian's Mausoleum, Castel Sant Angelo, Ponte Sant Angelo, Rome, Italy - The Castle was built in 123 AD by Emperor Hadrian as a monumental tomb for himself and his family. There is a secret corridor (Passetto di Borgo) that connects it to the Leonine walls and the Vatican, a passageway for the pope in dangerous situations. There were many popes who used it. Pope Alexander VI used it to escape to the castle from Charles VIII troops. And Clement VII who used it to escape the Landsknechts during the Sack of Rome in 1527, dodging a hailstorm of gunshots as he crossed.
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