the Hoops City Jazz Festival draws tens of thousands to Metro Center to hear famous jazz musicians. In 2011, the Vintage Sports Car Club of America moved its famous, annual Grand Prix from Pittsburgh to Springfield—the Springfield Grand Prix took place in 2012, on a 1.6-mile track through the center of the city. Outlying Hampden County towns such as Tolland are sparsely populated and close to the Berkshires—outdoor activities such as camping make up a large part of their economy. Politically, Hampden County leans liberal; however, it features several notably conservative cities and towns, such as Holyoke, Westfield, Agawam, Monson, and Palmer. Hampden County's largest city, Springfield, while historically moderate, politically, has become nearly as liberal as Hampshire County in recent years, according to voter registration and election results. Conservation Appreciation of the natural environs has, historically, been a large part of the Pioneer Valley life. It features numerous non-profit nature sanctuaries, such as Friends of Wissatinnewag, Inc. a sacred Native American burial grounds where the Turners Falls massacre occurred in 1676, as well as historic parks like King Phillip's Stockade in Springfield, the Forest Park, designed by Frederick Law Olmsted, and Western Massachusetts' only national park, the Springfield Armory National Historic Site. The Great Falls Discovery Center, the flagship visitor center of the multi-state, Silvio O. Conte National Fish and Wildlife Refuge is located in Turners Falls. In addition to these, there are hundreds of state and municipal parks and forests. Due to the considerable natural and cultural resources in the Pioneer Valley, environmental agencies have made a substantial investments in protecting unspoiled nature in the region, particularly along the Connecticut River, and in many of the Pioneer Valley's rural "hilltowns." Government conservation efforts have targeted wildlife and rare plant habitats, recreational sites and corridors including the Metacomet-Monadnock Trail, and the rich agricultural soils in farming towns such as Hadley, Massachusetts. Efforts have been augmented and assisted by local and regional conservation land trusts and statewide and national conservation organizations. Many of these organizations protect additional land through direct ownership of conservation areas and land held under conservation easement. Many municipalities in the area also have conservation holdings, usually under the aegis of the community's 'conservation commission', the appointed body which also applies local and state environmental regulations. One notable area consists of Mount Tom State Reservation, Mount Holyoke Range State Park, and Skinner State Park, which, joined with