The Fortress of São Sebastião dominates the northern tip of Mozambique Island. Its thick coral-stone walls, bastions, cisterns, and sea-facing guns make it the island's most dramatic structure and the clearest reminder of why the Portuguese held this place so tightly.
Take time inside rather than just photographing the walls. The views over the channel and the outer islets are superb, and the empty spaces help you understand the island's strategic role between East Africa, Arabia, and India.