Aid, Alcatraz, America, American, Architecture, Beacon, Building, California, City, Construction, Correctional facility, County, Detention centre, Fishermans Wharf, Government, High, Hill, Hills, Holding cell, Island, Islands, Jail, Landmark, Light, Lighthouse, Lock-up, Long, Natural, Nature, Navigational aid, North America, Outdoor, Penalty school, Penitentiary, Pier, Prison, Prison cell, Remand centre, San Francisco, Size, States, Structure, Tall, The Rock, US, USA, United States, Waterfront