Springfield is the seat of Missouri's Greene County and the center of a metropolitan statistical area that includes Christian and Greene counties. Called the Gateway to the Ozark Mountains, Springfield is part of a resort area whose primary attractions are the largest cave in North America, an outdoor exotic animal park, and Bass Pro Shops Outdoor World, one of the most-visited tourist attraction in the state. The Battle of Wilson's Creek was fought in the first year of the American Civil War near Springfield and the site is now a national battlefield monument. Today the city is a regional agribusiness center and a dairy-product shipping center. In 2004 Expansion Management magazine ranked Springfield 6th out of 331 U.S. metro areas for business expansion, citing its excellent public schools, low health care costs, and high quality of life.