The City and County of San Francisco is the fourth most populous city in California and the fourteenth-most populous in the United States, with a 2005 population of 739,426. In 1776, the Spanish settled the tip of the San Francisco peninsula, establishing a fort at the Golden Gate and a mission named for Francis of Assisi. Today San Francisco is renowned for its chilly summer fog, steep rolling hills, an eclectic mix of Victorian and modern architecture, and its peninsular location surrounded on three sides by the Pacific Ocean and San Francisco Bay. Famous hallmarks and landmarks include the Golden Gate Bridge, Alcatraz Island, the cable cars, the Transamerica Pyramid, Coit Tower, and Chinatown.