The architecture of Fremantle Prison includes the six-hectare (15-acre) site of the former prison on The Terrace, Fremantle, in Western Australia. Limestone was quarried on-site during construction, and the south-western corner (the South Knoll) and eastern portion of the site are at a considerably higher ground level. The Fremantle Prison site includes the prison cell blocks, gatehouse, perimeter walls, cottages, tunnels, and related infrastructure.