<Tr> <Td_colspan="2"> Official name: Washington Monument </Td> </Tr> <Tr> <Th> Designated </Th> <Td> October 15, 1966 </Td> </Tr> <Tr> <Th> Reference no . </Th> <Td> 66000035 </Td> </Tr> <Tr> <Td_colspan="2"> Location of Washington Monument in Central Washington, D.C. Washington Monument (the District of Columbia) Washington Monument (the US) Show map of Central Washington, D.C. Show map of the District of Columbia Show map of the US Show all </Td> </Tr>

Who laid the cornerstone of the washington monument