Fortaleza de Santiago and the Sesimbra Maritime Museum

The Fortaleza de Santiago is the 17th-century fort that looks out over the beach in the heart of Sesimbra. Inside are the tourist office and, since 2016, the Maritime Museum, made hand in hand with the fishing community: a Roman-era anchor stock, hooks and net weights from between 2500 and 200 BC, fishing gear, seafarers' devotions, the Luiz Saldanha marine park and King Carlos I, an oceanography enthusiast who sailed along this coast.

Admission, €3. From 16 September to 15 June it is open Tuesday to Sunday from 9:30 to 13:00 and from 14:30 to 18:00; from 16 June to 15 September, from 15:30 to 19:00 and from 20:30 to 23:00. You can enter up to an hour before closing. On Mondays it is closed.