Odiham Castle
Odiham Castle near Greywell in Hampshire is a ruined royal castle of the early thirteenth century, built by King John between 1207 and 1212 and notable as the base from which John set out for Runnymede to sign Magna Carta in 1215. The castle was later the prison of King David II of Scotland following his capture at the Battle of Neville's Cross in 1346. The unusual octagonal keep, of which the lower courses survive, is one of only a handful of examples of this plan type in England. The castle is managed by Hampshire County Council and is accessible from a pleasant walk along the Basingstoke Canal towpath through the attractive Hampshire countryside. The canal setting, with narrowboats passing the medieval ruins, creates one of the more distinctive heritage experiences in southern England.