Originally, it had a star-shaped plan with a bastion at each vertex and hexagonal sentry boxes. The interior contained buildings for the garrison, such as barracks and a chapel. Currently, only two vertices with their respective sentry boxes remain. On the north face, there is a set of four buildings, including a large rectangular body facing the beach that integrates a metal lighthouse in the center, and three adjoining quadrangular bodies. The current lighthouse is a fifteen-meter iron tower, commissioned in 1922 and completed in April 1925, being one of the rare existing metal lighthouse towers in Portugal. The adaptation of the structure to incorporate this modern lighthouse in the 20th century demonstrates the capacity for adaptive reuse of old military structures for new maritime infrastructure needs, giving it a vital contemporary function and contributing to its partial maintenance.