Old Sarum

"Massive earthwork ramparts on a bare sweep of Wiltshire countryside are all that remain of this impressive Iron Age hill fort, which was successively taken over by Romans, Saxons, and Normans (you can still see the ruins of a castle built by William the Conqueror in 1070 within the earthworks)" Full review

"You can wander the grassy ramparts, see the original cathedral's stone foundations, and look across the Wiltshire countryside to the spire of the present Salisbury Cathedral." Full review