Fremantle Prison, sometimes referred to as Fremantle Gaol or Fremantle Jail, is a former Australian prison and World Heritage Site in Fremantle, Western Australia. The six-hectare site includes the prison cellblocks, gatehouse, perimeter walls, cottages, and tunnels. Initially known as the Convict Establishment (or just The Establishment), Fremantle Prison was constructed between 1851 and 1859, using convict labour.