Castel Sant’Angelo, also known as the Mausoleum of Hadrian, is a historic landmark located on the banks of the Tiber River in Rome, Italy. Today, Castel Sant’Angelo is a museum that showcases a collection of artwork, artifacts, and historical exhibits related to its storied past. It provides visitors with a fascinating glimpse into the military, political, and cultural history of Rome, making it a must-visit destination for history enthusiasts and tourists alike.