Grant Park is a large urban park (319 acres or 1.29 km²) in the Loop community area of Chicago, Illinois. Located within the city's central business district, the park's most notable features are Millennium Park, Buckingham Fountain, the Art Institute of Chicago, and the Museum Campus. Originally known as Lake Park, and dating from the city's founding, it was renamed in 1901 to honor US President Ulysses S.