The Château de Tours, is a castle located in Tours, Indre-et-Loire, France. Built in the 11th century, the building displayed an architecture of the Carolingian period, and was the residence of the Lords of France. Until the 2000s, the Royal Castle of Tours was used as an aquarium where about 1,500 fish of 200 different species could be seen. It also served as Grévin museum. The castle was classified as monument historique on 20 August 1913.