What Roman lighthouse in Spain is the oldest Roman lighthouse still in use?

The Roman lighthouse in Spain regarded as the oldest surviving Roman lighthouse still in use is the Tower of Hercules.

The tower stands on a peninsula at A Coruña in Galicia, overlooking the Atlantic. Its Roman core dates to the 1st century AD, and an inscription credits the architect Gaius Sevius Lupus of Aeminium, in present-day Coimbra, with dedicating the structure to Mars. The lighthouse was associated with the Roman port and settlement of Brigantium.

The surviving monument is about 55 metres tall, but its present appearance includes a major neoclassical restoration completed in 1791. That work preserved the ancient central core while rebuilding the exterior and restoring its navigational function. The tower has remained in continuous use since at least the 2nd century.

Its name also fuels legends linking it to Hercules and the Celtic hero Breogán. It should not be confused with the vanished Pharos of Alexandria or reconstructed Roman lighthouse remains elsewhere. UNESCO listed the Tower of Hercules as a World Heritage Site in 2009.