The Puerta de San Vicente ( Gate of St Vincent ) and Puerta del Alcazar ( Gate of the Fortress ) are flanked by twin towers , 20 metres high , linked by a semicircular arch .
The Puerta de San Vicente ( Gate of St Vincent ) and Puerta del Alcazar ( Gate of the Fortress ) are flanked by twin towers , 20 m high , linked by a semicircular arch .