There are more than 1000 castles in Holland. Most of the castles in Holland, some of which may be called a slot (manor house) or a burcht (fortress), were built during the Middle Ages as defensive structures. Over the years, the purpose of these castles changed, and many become more of a country estate or palace, where the privileged citizens would spend the summer months to relax. These days, many castles are a local attraction where visitors come to admire the architecture, art collections and gardens. Several castles focus primarily on children, giving them the opportunity to pretend they are knights or damsels for a day. The castles of Holland offer something for everyone, reason enough to visit a castle.