A public park located just west of St. Louis City. It is covers 1,371 acres (5.55 km2).The park opened in 1876, and has hosted several significant events, including the 1904 World's Fair and the 1904 Summer Olympics. The park is known as the "heart of St. Louis" and is home to the St. Louis Zoo, the Saint Louis Art Museum, the Missouri History Museum, and the St. Louis Science Center.