The Gate can be visited
Torre de la Calahorra

In the historic old town of Córdoba, Spain, the Torre de la Calahorra is a fortified gate. Originally built by the Almohads, it served to protect the adjacent Roman Bridge over the Guadalquivir.
History+
The origins of the Torre de la Calahorra date back to the late 12th century when the Almohads constructed it as a defensive structure. It initially comprised an arched gate flanked by two square towers. In 1369, a restoration was undertaken under King Henry II of Castile. During this period, a third tower was added, connecting the existing towers in the shape of two cylinders.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: Daniel Pelletier
This description draws on the facts documented in the linked Wikipedia article; Wikipedia content is licensed under CC BY-SA 4.0. Wording and editing: Mobile History.
Location: 37.8756, -4.7766