<Tr> <Th> Architect </Th> <Td> Renzo Piano </Td> </Tr> <Tr> <Th> Website </Th> <Td> www.calacademy.org </Td> </Tr> <P> The California Academy of Sciences is a natural history museum in San Francisco, California, that is among the largest museums of natural history in the world, housing over 26 million specimens . The Academy began in 1853 as a learned society and still carries out a large amount of original research, with exhibits and education becoming significant endeavors of the museum during the 20th century . </P> <P> Completely rebuilt in 2008, the building covers 400,000 square feet (37,000 square metres) and is among the newest natural history museums in the United States . The primary building in Golden Gate Park reopened on September 27, 2008 . </P>

When was the california academy of sciences built