Watchtower
The tower was built at around the year 1220, by order of governor Abu Eola. The tower was part of the city's defensive walls and it was linked to an octagonal tower nearby, the Torre de la Plata or Silver Tower, which has also been preserved.At the time the watchtower was used to control access to the city's port. A large chain connected the Torre del Oro with yet another tower across the river. When the chain was raised, it would block all ships from entering the city.