The history of this fortress includes the incarceration of George Fox. Fox, who founded the Quakers was imprisoned here in 1656. Nowadays you can stretch out, kick back, enjoy your picnic and revel in the lovely verdant surroundings and the picturesque, breath-taking valley below. The building, resting on a hillock, stands proud and tall. Its centrepiece is an uncommon keep, made up of around tower, built during the 13th century and surrounding the shell keep, one that was made earlier. You can clamber up a staircase inside the two shells to the top of the tower and the top of the hill. It's worth it for the stunning view.