Castle of San Marcos (El Puerto de Santa María)

Castle of San Marcos
Castle of San Marcos
Native name; Castillo de San Marcos (Spanish)
	Front view of Castle of San Marcos
Location	El Puerto de Santa María, Cádiz, Spain
Coordinates	36°35′47.04″N 6°13′35.91″W / 36.5964000°N 6.2266417°W
Spanish Cultural Heritage
Official name	Castillo de San Marcos, Castillo de Alfonso X El Sabio
Type	Non-movable
Criteria	Monument
Designated	1920-08-30
Reference no.	(R.I.) - 51 - 0000183 - 00000
	Location of Castle of San Marcos in Spain

Castle of San Marcos (also Castillo de Alfonso X El Sabio) is a medieval castle located in El Puerto de Santa María, Cádiz, Spain. 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.

Close to the castle there is a replica of the map of Juan de la Cosa, along with an explanatory plaque, and a little fountain.

Conservation

The castle was declared a national monument on 30 August 1920 and is currently listed in the Spanish heritage register as a Bien de Interés Cultural.^{[citation needed]}