High Quality Content by WIKIPEDIA articles! Maiden Castle is an Iron Age hill fort 2.5 kilometres (1.6 mi) south west of Dorchester, in the English county of Dorset. Hill forts were fortified hill-top settlements constructed across Britain during the Iron Age. The name Maiden Castle may be a modern construction meaning that the hill fort looks impregnable, or it could derive from the British Celtic mai-dun, meaning a "great hill."