Located just down the road from St.
Peter's and the Vatican, what is now called
the Castel Sant'Angelo was originally designed as the mausoleum for the
Emperor Hadrian. It was connected by a bridge that headed straight into
the heart of rome, and looked significantly different than it does today.
As with most of the ancient structures
in the city, it suffured horribly during the years, as it was transformed
into a military fortress and subsequently overrun and looted several times
by the barbarian tribes that overran the city in th 5th and 6th centuries.
It has also served as a protective sanctuary for the pope and is connected
to the Vatican by the Vatican Corridor, a wall
route for him to travel through in safety (and anonimity).