Castillo de Coyanza Valencia de Don Juan

Valencia de Don Juan, Spain, Spain

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Castillo de Coyanza, located in Valencia de Don Juan in Spain's León province, originated as an Iron Age hill-fort later fortified by Romans and medieval kings, hosting the pivotal 1055 Council of Coyanza that shaped ecclesiastical reforms under Ferdinand I of León.

Rebuilt in the 15th century in striking Gothic-Mudéjar style by the counts of Valencia de Don Juan on the Esla River amid slender cylindrical towers clustered closely together, it exemplifies Iberian military architecture with its vertical aesthetic and expansive layout. 

Declared a National Monument, the fortress now houses a museum displaying archaeological finds from Bronze Age through Renaissance periods, illuminating the Acuña and Portugal families' legacy alongside the town's ancient roots as Castrum Covianca.