No 5 San Francisco

The sun sets near the Golden Gate Bridge before a fireworks show during the 75th anniversary celebration of the iconic span in San Francisco, California, May 27, 2012. [Photo/Agencies]

San Francisco is known for several landmarks, including the Golden Gate Bridge, cable cars, and its Chinatown district. The city is also the headquarters of many companies such as Levi Strauss & Co, Gap Inc, Dropbox, Yelp, Twitter and Uber.