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The Castel Sant’Angelo, meaning “Castle of the Holy Angel,” was commissioned by the Roman emperor, Hadrian, and designed to be a mausoleum for himself and his family. Known also as the Mausoleum of Hadrian, it is located in the Parco Adriano, a park within Rome, Italy. It is almost 2 millenniums old, having been built between 135 and 139 AD.
It was decommissioned in 1901, and it is now a museum, known as the Museo Nazionale di Castel Sant’Angelo.