Castillo de Santa Catalina Cádiz The Castle of Santa Catalina is a castle located in Cádiz, Spain. It was declared Bien de Interés Cultural in 1993. Past exhibitions (1) Exhibition "La Explosión de Cádiz de 1947" from 17 Aug 2017 A focused exhibition exploring the catastrophic 1947 explosion in Cádiz, Spain — one of the deadliest industrial disasters in the country's modern history.