The Tower of Hercules is a lighthouse and a Roman-era structure located in A Coruña, Galicia, in northwestern Spain. It is one of the oldest lighthouses in the world and has been in continuous use since the 2nd century AD.

The tower stands 55 meters (180 feet) tall and is built of masonry. It is located on a rocky promontory overlooking the Atlantic Ocean and the entrance to the A Coruña harbor. The structure has been modified and renovated several times over the centuries, but its basic form remains largely unchanged.

The tower is named after the legendary hero Hercules, who according to ancient mythology, built a giant tower at the edge of the world to mark the boundary between the known and unknown lands. The tower's Roman-era origins are reflected in its architectural style, with a rectangular base and a cylindrical tower, topped with a lantern room and a weather vane.

Today, the Tower of Hercules is a UNESCO World Heritage Site and a popular tourist attraction. Visitors can climb to the top of the tower for stunning views of the coastline and the city of A Coruña. The surrounding area is also a popular park and recreational area, with beaches, walking trails, and picnic areas.