Fortaleza de São Francisco do Penedo
Fortaleza de São Francisco do Penedo (Fort of Penedo) is a 17th-century coastal fortress situated in the port area of Luanda. Constructed between 1689 and 1700 to defend the northern approaches of Luanda Bay, it later served as a slave transit depot, a maritime quarantine station, and a high-security colonial prison. The damp, isolated sea fort has long been associated with ghost sightings, subterranean shrieks, and phantom prisoner light displays.