Castel Sant’Angelo, also known as the Mausoleum of Hadrian, is a historic fortress in Rome, originally built as a mausoleum for the Roman Emperor Hadrian in the 2nd century AD. It is located on the right bank of the Tiber River and has served various roles throughout history, including a papal residence, fortress, and prison. The castle is notable for its cylindrical structure and panoramic views of Rome from its terrace. It is connected to Vatican City by the Sant’Angelo Bridge, adorned with statues of angels. Today, Castel Sant’Angelo is a museum showcasing a range of historical artifacts, artwork, and exhibits, offering visitors a glimpse into its diverse history and architectural significance.