<Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (February 2015) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (February 2015) (Learn how and when to remove this template message) </Td> </Tr> <P> The conservation - restoration of the Statue of Liberty spanned from 1984 to 1986 . The Statue of Liberty (Liberty Enlightening the World by Frédéric Auguste Bartholdi) is a colossal monument on Liberty Island in New York Harbor and is a part of the Statue of Liberty National Monument . Much of the restoration effort was based on unprecedented restorative methods, owing largely to the fact that metallurgical repair work on such a scale had never been attempted before . Many professional scientists and engineers, government organizations and various consultants were called in to evaluate and deal with the various problems and tasks facing the restoration effort . </P> <P> After the statue was restored, it was reopened during Liberty Weekend, on July 3--6, 1986 . </P>

When was the last time the statue of liberty was cleaned