The Hague, a city in the province of South Holland, is the seat of the Dutch parliament and government.The Binnenhof building is a 13th century palace complex surrounded by open plazas, including the Het Plein and the Grote Markt. Today, it's the seat of the government of Holland. It used to be a castle, surrounded by oats on all sides but was modified over time to accommodate the government.In the city center, visitors will find historic architecture form the medieval, Renaissance, and baroque periods—all easily accessible on foot. The city boasts four royal palaces, one of which is now a museum housing a gallery dedicated to the work of graphic artist M.C. Escher.Travelers will also want to take a stroll along the Lange Voorhout, a large tree-lined square bordered by grand 18th century townhouses. On Thursdays and Sundays, passersby will find an antique and book market. In the summer, the square hosts a free outdoor sculpture exhibition.