Atlanta is the capital and the most populous city of the State of Georgia, and the central city of the ninth most populous metropolitan area in the United States. Common nicknames for the city include A-Town, The A-T-L (derived from its IATA airport code), The Big Peach, The 4-0-4 (derived from its area code), and Hotlanta. Atlanta boasts a variety of museums on subjects ranging from history to fine arts, natural history, and beverages. Prominent among them are sites honoring Atlanta's participation in the civil rights movement.