San Francisco officially the City and County of San Francisco, is the cultural, commercial, and financial center of Northern California and the only consolidated city-county in California.San Francisco (Spanish for Saint Francis) was founded on June 29, 1776, when colonists from Spain established Presidio of San Francisco at the Golden Gate and Mission San Francisco de Asís named for St. Francis of Assisi a few miles away.San Francisco is a popular tourist destination, known for its cool summers, fog, steep rolling hills, eclectic mix of architecture, and landmarks including the Golden Gate Bridge, cable cars, the former Alcatraz Federal Penitentiary, and its Chinatown district.San Francisco is also the headquarters of five major banking institutions and various other companies such as Levi Strauss & Co., Gap Inc., Salesforce.com, Dropbox, Reddit, Square, Inc., Airbnb, Weebly, Pacific Gas and Electric Company, Yelp, Pinterest, Twitter, Uber, Mozilla, Wikimedia Foundation, and Craigslist. It has several nicknames, including "The City by the Bay", "Fog City", "San Fran", and "Frisco", as well as older ones like "The City that Knows How", "Baghdad by the Bay", and "The Paris of the West".
Although the Financial District, Union Square, and Fisherman's Wharf are well-known around the world, San Francisco is also characterized by its numerous culturally rich streetscapes featuring mixed-use neighborhoods anchored around central commercial corridors to which residents and visitors alike can walk. Because of these characteristics, San Francisco is ranked the second "most walkable" city in the U.S. by Walkscore.com.Many neighborhoods feature a mix of businesses, restaurants and venues that cater to both the daily needs of local residents while also serving many visitors and tourists.Some neighborhoods are dotted with boutiques, cafes and nightlife such as Union Street in Cow Hollow, 24th Street in Noe Valley, Valencia Street in the Mission, Grant St. in North Beach, and Irving Street in the Inner Sunset.San Francisco's War Memorial and Performing Arts Center hosts some of the most enduring performing-arts companies in the U.S. The War Memorial Opera House houses the San Francisco Opera, the second-largest opera company in North America as well as the San Francisco Ballet, while the San Francisco Symphony plays in Davies Symphony Hall.San Francisco Museum of Modern Art, de Young Museum, Asia Art Museum, California Academy of Sciences, Exploratorium, Contemporary Jewish Museum, Cable Car Museum are the famous museum in San Francisco.