English Heritage: Berkhamsted Castle
One of the country's most impressive motte and bailey castles, Berkhamsted was originally built during the Norman Conquest but fell into ruin during the 16th century. It was further damaged in 1834 when the works for the London and Birmingham Railway demolished the gatehouse. You can still see the walls, ditches and earthworks.
The site is served by two bus routes: Arriva The Shires 354 and Little Jim's 532. Berkhamsted station is directly adjacent.