<Table> <Tr> <Th_colspan="2"> Alcatraz Island </Th> </Tr> <Tr> <Td_colspan="2"> IUCN category V (protected landscape / seascape) </Td> </Tr> <Tr> <Td_colspan="2"> Alcatraz Island, San Francisco Bay, July 2, 2017 </Td> </Tr> <Tr> <Td_colspan="2"> Show map of San Francisco Show map of California Show map of the US Show all </Td> </Tr> <Tr> <Th> Location </Th> <Td> San Francisco Bay, California, US </Td> </Tr> <Tr> <Th> Nearest city </Th> <Td> San Francisco, California </Td> </Tr> <Tr> <Th> Coordinates </Th> <Td> 37 ° 49 ′ 36" N 122 ° 25 ′ 24" W ﻿ / ﻿ 37.82667 ° N 122.423333 ° W ﻿ / 37.82667; - 122.423333 Coordinates: 37 ° 49 ′ 36" N 122 ° 25 ′ 24" W ﻿ / ﻿ 37.82667 ° N 122.423333 ° W ﻿ / 37.82667; - 122.423333 </Td> </Tr> <Tr> <Th> Area </Th> <Td> 22 acres (8.9 ha) </Td> </Tr> <Tr> <Th> Established </Th> <Td> 1934 (1934) </Td> </Tr> <Tr> <Th> Governing body </Th> <Td> National Park Service </Td> </Tr> <Tr> <Th> Website </Th> <Td> Alcatraz Island </Td> </Tr> <Tr> <Th_colspan="2"> </Th> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Td_colspan="2"> Alcatraz </Td> </Tr> <Tr> <Td_colspan="2"> U.S. National Register of Historic Places </Td> </Tr> <Tr> <Td_colspan="2"> U.S. National Historic Landmark District </Td> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Td_colspan="2"> The Social Hall, destroyed by fire during the Native American occupation . </Td> </Tr> <Tr> <Th> Area </Th> <Td> 47 acres (19 ha) </Td> </Tr> <Tr> <Th> Built </Th> <Td> 1847 </Td> </Tr> <Tr> <Th> Architect </Th> <Td> U.S. Army, Bureau of Prisons; U.S. Army </Td> </Tr> <Tr> <Th> Architectural style </Th> <Td> Mission / Spanish Revival </Td> </Tr> <Tr> <Th> NRHP reference #</Th> <Td> 76000209 </Td> </Tr> <Tr> <Th_colspan="2"> Significant dates </Th> </Tr> <Tr> <Th> Added to NRHP </Th> <Td> June 23, 1976 </Td> </Tr> <Tr> <Th> Designated NHLD </Th> <Td> January 17, 1986 </Td> </Tr> <Tr> <Th_colspan="2"> </Th> </Tr> </Table> <Tr> <Th_colspan="2"> Alcatraz Island </Th> </Tr> <Tr> <Td_colspan="2"> IUCN category V (protected landscape / seascape) </Td> </Tr>

When was the last time alcatraz was used