I thought the £5 fee to do the tour of the Keep and the other mediaeval buildings of this castle is great value as EH don't always have the most competitive entry fees. This price includes an audio guide which consists of amusing banter between an English soldier and a Napoleonic prisoner imparting quite a lot of history about the site, the prisoners of war were responsible for digging out and creating the Portsmouth Harbour of today.
To note steep staircases in the Keep and a stone spiral one to the roof. The Roman walls around the perimeter of the castle are the most complete in Northern Europe.
The free car park may be a bit inadequate in the busy season.
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