What is Hadrian's Mausoleum?
[[File:Castel Sant'Angelo ( Mausoleo di Andriano).jpg|thumb|250px|]] The '''Mausoleum of Hadrian''', now known as '''Castel Sant'Angelo''' is a towering cylindrical building in Parco Adriano, [[Rome]]. It was 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. It is now a museum. The structure was once the tallest building in Rome. [[Category:Buildings and structures in Rome]] {{stub}}