 Many Dutch tourist attractions are rijksmonuments, such as castles or windmills.Some notable windmills are De Schoolmeester, Westzaan, a smock mill in North Holland, the only wind powered paper mill in the world, listed as rijksmonument number 40013; De Wieker Meule, De Wijk, in Drenthe province, built in 1829 and restored to working order, listed as rijksmonument number 39657; and Mellemolen, a hollow post mill in Friesland, also restored to working order, listed as rijksmonument number 35937.Among the rijksmonuments are also many churches.