Castle of Valencia de Don Juan Monument · Valencia de Don Juan, Esla-Campos, León A 15th-century fortress of military Gothic raised on a hill beside the Esla, on a site inhabited since the Bronze Age. Declared a monument on 3 June 1931, its moat today houses the city's municipal auditorium. Photo: Ugliku (CC BY-SA 3.0 es) What to see and do in Valencia de Don Juan