Maiden Castle is an Iron Age hill fort, one of many fortified hill-top settlements constructed across Britain during the Iron Age, but one of only seven in the county of Cheshire in northern England. The hill fort was probably occupied from its construction in 600 BC until the Roman conquest of Britain in the 1st century AD. Since then it has been quarried and used for military exercises. It is protected as a Scheduled Ancient Monument, and is owned by the National Trust. The hill fort is open to visitors, but unrestricted access to the site has resulted in it being classified as "at high risk" from erosion.