The cylindrical profile of Hadrian's Mausoleum — converted to a papal fortress — is visible from both riverbanks. The Lungotevere Castello walk along the Tiber gives a clear view of the structure from outside at no cost. The Ponte Sant'Angelo bridge (lined with Bernini-designed angel statues) is always open and free.
- Best for: Architecture fans, photographers, evening walkers
- Duration: 20–30 minutes
