Fort of Santiago do Outão

The oldest identified structure at Outão is a lighthouse and watchtower at the mouth of the Sado River that was erected by João I in 1390.

In 1572, during the reign of Sebastião I, the watchtower underwent a major expansion and was surrounded by fortified walls and transformed into a fortress by Afonso Álvares.

Santiago do Outão remained loyal to Philip III until December 8, 1640, during the Portuguese Restoration War.

The fort underwent a remodeling during the reign of João IV beginning in 1643 in order to provide better defenses at the entrance to Setúbal's port.

Finally, the compound was converted into the Hospital Ortopédico Sant'Iago do Outão in 1909 which it remains as to the present day.