https://www.openstreetmap.org/way/188997799 Street view: https://goo.gl/maps/t4juVdH17RkXP75K7
https://www.fincaderequesens.cat/castell-de-requesens/ (thanks to @synthetic_being@lemmy.cat for finding this)
Probably existing since the 9th century, the castle is mentioned for the first time in a document from Ponce I, count of Ampurias in the 11th century.
In the 19th century, the ruined castle was rebuilt in a neo-medieval style. The castle was extensively used after the Spanish Civil War (1936–1939), when some modern constructions were added to the original structure.
Thanks, chief! Adding above.