The Tower of Hercules is the oldest known extant Roman lighthouse. Built in the 1st century, the tower is located on a peninsula about 2.4 km (1.5 mi) from the center of A Coruña, Galicia, in northwestern Spain. Until the 20th century, it was known as the Farum Brigantium. The Latin word farum is derived from the Greek Φάρος, Pharos, for the Lighthouse of Alexandria. The structure stands 55 metres (180 ft) tall and overlooks the North Atlantic coast of Spain. The tower was renovated in 1791.

A lighthouse is a tower, building, or other type of physical structure designed to emit light from a system of lamps and lenses and to serve as a beacon for navigational aid, for maritime pilots at sea or on inland waterways.