Once a barren prairie, Oklahoma City became a prosperous modern day city practically overnight when the unassigned land was opened to white settlement. Today the oil industry is a major contributor to its prosperity, as well as Stockyards City, which is the largest stocker and feeder cattle market in the world. Oklahoma City is the epicenter of Oklahoma, situated directly in the middle of the state, making it an ideal capital city. The State Capitol Building grounds are uniquely Oklahoma, with the world's only working oil well beneath a state capitol. Oklahoma City has also had its share of tragedy: the memory of those lost in the bombing of the Alfred P. Murrah Federal Building in 1995 will remain in the hearts of many for years to come. The Oklahoma City National Memorial stands to remember the 168 lives that were lost. Other Oklahoma City attractions include the National Cowboy Hall of Fame and the Frontier City Theme Park.