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Castel Sant’Angelo
Castel Sant’Angelo was originally built as the mausoleum for Emperor Hadrian in 139 AD, and it has been many things since. It has served as a fortress, a prison, a papal residence, a museum, and a national monument. However, Castel Sant’Angelo is still listed among the famous Roman buildings. Castel Sant’Angelo is connected to St Peter’s Basilica by a fortified corridor called the Passetto di Borgo, which allowed popes to escape in times of danger. Castel Sant’Angelo is also known for its angel statue on top, which gives it its name.
