The Mausoleum of Hadrian, usually known as Castel Sant'Angelo (English: Castle of the Holy Angel), is a towering cylindrical building in Parco Adriano, Rome, Italy. It was initially commissioned by the Roman Emperor Hadrian as a mausoleum for himself and his family. The building was later used by the popes as a fortress and castle, and is now a museum. The Castel was once the tallest building in Rome.
Latitude: 41° 54' 11.03" N
Longitude: 12° 27' 58.88" E