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.
Text adapted from “Castle of San Marcos (El Puerto de Santa María)” on Wikipedia, CC BY-SA 4.0.
Castillo de San Marcos (El Puerto de Santa María) ranks #3,555 of 9,035 worldwide in the atlas's castle fame ranking, and #142 of the 606 mapped in Spain. Its Wikipedia articles were opened 1,171 times in the last 60 days, more than 55% of the atlas. 13 more atlas landmarks stand within 25 km. The nearest day-trip guide is Cádiz, 9 km away. It is one of the 123 landmarks on the atlas's regional map of Andalusia. It is stop 6 of 30 on the Andalusian frontier castles, Cádiz to Córdoba. See how Spain compares in the castle statistics.
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