Castel Sant'Angelo

Mausoleum of Hadrian

Mausoleum of Hadrian Shown within Augustan Rome
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Coordinates	41°54′11″N 12°27′59″E / 41.9031°N 12.4663°E / 41.9031; 12.4663
Type	Mausoleum
History
Builder	Hadrian
Founded	123–139 AD

The Mausoleum of Hadrian, also known as Castel Sant'Angelo (Italian pronunciation: [kaˈstɛl sanˈtandʒelo]; English: Castle of the Holy Angel), is a towering rotunda (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 popes later used the building as a fortress and castle, and it is now a museum. The structure was once the tallest building in Rome.