From its rural beginnings in 1922 as the L.A. County Fairgrounds, Los Angeles County's Fairplex has grown to become the fourth largest fairgrounds in North America. At 543 acres the facility is twice the size of Disneyland and hosts a year-round variety of concerts, conventions, shows and sporting events. The Fairplex grounds are home to more than 325,000 square feet of indoor exhibit space, including a 12,000 square foot Fine Arts educational center affiliated with the Smithsonian Institution. The complex also houses carnival grounds, parks, plazas and picnic areas, as well as a 250-suite Sheraton Hotel and a 185-space KOA RV park. Also calling the Fairplex home is NHRA-rated Pomona Raceway and Fairplex Park, a 5/8-mile horse racing facility. Both racetracks also host numerous concerts and performance events. Not surprisingly for a facility of its size, the Fairplex is constantly evolving, growing and modernizing its infrastructure, currently including a high-end revamping of the complex's audio systems.