Nonetheless, it is renown for its steep urban streets, comprehensive mix of historical Victorian and modern architecture, and other well-known landmarks. Located right off of Pier 33 and near the infamous Fisherman's Wharf, Alcatraz is a historical landmark situated on Alcatraz Island that draws thousands of tourists each day. It is an integral party of America's history, as the establishment served as a a Civil War fort, a military prison, and a federal prison until 1963. Today, this national recreation area is run by the National Parks Service. The "Night Tour" is the most authentic way of exploring this area, which provides round-trip transportation to the island and the audio tour of the remaining military base, cell house, and lighthouse. The Golden Gate Bridge is easily the most distinguishable landmark in all of San Francisco. It is synonymous with San Francisco's culture and is one of the most photographed structures in the world. The structure was appropriately named because it spans over the Golden Gate, which is the opening of the San Francisco Bay into the Pacific Ocean. The actual color of the bridge is called "international orange" and was selected by Irving Morrow because it "compliments the natural surroundings and enhances the bridge's visibility in [San Francisco's famous morning] fog." Many visitors will drive over it or simply walk across it to experience this fundamental part of San Francisco. Another attraction, that should be considered more of a "moving" attraction, is San Francisco's notorious cable car system. It is the absolute last manual operated cable car system in the world, and in turn, a true icon for the city. The cable cars are used by residents in their commute to and from work, but their small service areas and their expensive fares primarily make them a mobile attraction for tourists seeking an authentic San Francisco experience. The history and modern-day pop culture integrated into the city give it a great balance and speak to the needs of every tourist passing though. It's easy to see why San Francisco has become an iconic city in Northern California and is a favorite international travel destination.