The Ancient Mausoleum – Explore the remains of Hadrian’s original tomb, dating back to the 2nd century. Papal Apartments – Admire Renaissance frescoes and the opulent rooms where popes once lived. The Armory & Prison Cells – Discover medieval weapons and the dark dungeons where prisoners, including the famous philosopher Giordano Bruno, were once held. The Angel’s Terrace – Enjoy one of the best panoramic views of Rome, overlooking the Tiber River, St. Peter’s Basilica, and the Vatican. The Secret Passage (Passetto di Borgo) – Though not always open to the public, this hidden corridor once connected the Vatican to the castle, serving as an escape route for popes in times of danger.