El Puerto de Santa María - Spain

 This a Spanish card but it was signed and sent during the 17th Portuguese Postcrossing Meeting. Vitória knew that a castle card would make me happy. 

El Puerto de Santa María locally known as El Puerto, is located on the banks of the Guadalete River in the province of Cádiz, Andalusia.

 

The castle was erected as a fortified church by King Alfonso X of Castile. It was built on the site of a mosque of which the wall of the qibla survives.

Already in the Modern Era, with the city in the hands of the nobiliary house of Medinaceli, is when another of the great reforms in the building takes place. Specifically during the dukedom of Luis de la Cerda (1479-1501) works were carried out such as the exterior wall or the sacristy of the church; coinciding with a period of splendor for the city of El Puerto due to the discovery and conquest of the American continent.
The Castle of San Marcos was key to this historical event, possibly housing such important personalities as Alonso de Ojeda, discoverer of the mouth of the Amazon River; Juan de la Cosa, who reflected the silhouette of the New Continent for the first time on a map made in the year 1500 or Christopher Columbus himself. - in: https://castillodesanmarcos.com