 The region contains most the 180 preserved or restored castles and manor houses in Croatia—most of the best preserved-ones were built in the 17th and 18th centuries, when the Ottoman conquest was no longer a threat.A substantial number of buildings were destroyed in the Second World War.The largest number of preserved castles and manor houses are situated in Hrvatsko Zagorje, including the Trakošćan Castle—the most beautiful castle in Croatia.