Portoferraio's loftiest highest hill is crowned by this largely intact, 16th-century fort (1548) – a key point, together with Fort Stella and Torre del Martello, in the defensive ring built around the town by Cosimo l de' Medici. From Piazzale Napoleone head uphill along Via del Falcone then bear right along a small winding path that leads to the fort.
If you're planning to visit the fort alongside other sights, invest in a Cosmopoli Card (adult/reduced €14/10) covering admission to several Portoferraio key sights over seven days.