Discover the mysterious monument on the Tiber, following an expert and local guide, who will tell you the interesting and historical facts. Together with your expert guide, you will admire the paintings, ancient fortified walls and statues that adorn the castle. Castel Sant'Angelo in Rome was originally built as the tomb of the Roman emperor Hadrian in 135 AD. This mausoleum was later converted into a military fortress that protected Rome during the Middle Ages. Since then, it has served as a papal residence, a prison during the Renaissance era and now, as one of Rome's museums. In addition to serving as a repository of historical information, it is a site of immense cultural value that houses many sculptures, architecture, frescoes and more.