Sacramento is the state capital of California in the United States. It is the regional center for the Greater Sacramento metropolitan area, which dominates much of the surrounding Sacramento Valley and stretches into parts of Gold Country. Sacramento is the oldest incorporated city in California, settled between the confluences of the Sacramento and American rivers. The city has been the site of many important historic events that have shaped California and U.S. history, most notably the California Gold Rush and location of the original terminus of the First Transcontinental Railroad. Much of this historical legacy has been preserved, especially in the historic Old Sacramento district, where buildings and railroads from that era continue to attract visitors.