There are over 800 Rijksmonuments (national heritage sites) in the municipality of Leeuwarden. The Oldehove, a leaning unfinished church tower, is a symbol of the city. Other well-known buildings in the city centre include the "Kanselarij" (former chancellery), the Stadhouderlijk Hof (former residence of the stadtholders of Friesland), the city hall (1715), the "Waag" (old weigh house), the Saint Boniface church (an important part of the neogothic movement) and the "Centraal Apotheek", a pharmacy in the Art Nouveau style. The "Blokhuispoort" is a former prison that has been transformed into a public library, hostel and restaurant.