Downtown Honolulu is the business center of Oahu. Central is the state's government center including the state capitol building, Honolulu Hale (city hall), judiciary buildings and Washington Place (the Governor's official residence). The Hawaii State Library also is located here, as well as 'Iolani Palace, the only palace on U.S. soil, and Mission Houses Museum, which contains the oldest existing house in Hawaii Eating venues are in abundance with countless plate lunch locations. An easy to find place filled with an abundance of locally-made products is Native Books & Beautiful Things, which specializes in Hawaiian artwork, food, clothing and much more. Inland of downtown Honolulu, visitors will find the 20-acre Foster Botanical Gardens, a popular place to enjoy a picnic while surrounded by exotic flora and fauna.