San Francisco is the fourth most populous city in California and the 13th most populous city in the United States, with a population of 805,235. In 1776, colonists from Spain established a fort at the Golden Gate and a mission named for Francis of Assisi on the site. Today, San Francisco is one of the top tourist destinations in the world, ranking 33rd out of the 100 most visited cities worldwide. San Francisco is located on the West Coast of the United States at the tip of the San Francisco Peninsula and includes significant stretches of the Pacific Ocean and San Francisco Bay within its boundaries. Several islands—Alcatraz, Treasure Island, and the adjacent Yerba Buena Island, and a small portion of Alameda Island, Red Rock Island, and Angel Island are part of the city. Also included are the uninhabited Farallon Islands, 27 miles (43 km) offshore in the Pacific Ocean.
San Francisco is famous for its hills. There are more than 50 hills within city limits.
A popular quote incorrectly attributed to Mark Twain is "The coldest winter I ever spent was a summer in San Francisco."