Perimeter walls of Beaumaris Gaol

The perimeter of the gaol is composed of coursed freestone walls approximately 15m high and 55m by 32m, with freestone coping and a slight batter at the base. Each side has shallow buttresses rising to three-quarter height, and clasped at the angles. The main entrance, to Bunkers Hill on the N side, is between splayed sections of the perimeter wall that abut the main prison building. It has 4 lower freestone piers with central double iron gates, and flanking bays with railings on dwarf walls.

On the S side the wall rises higher, in 2 steps, to accommodate the extension to the S wing made in 1867. Subsequently a doorway, in a concrete surround, was inserted in the wall at this point, with boarded door. On the E side is a wider buttress to the R of centre, at the top of which is a studded door, over which the gallows was fixed. On the inner side of the wall at this point is a bell surmounted by a wooden cross.

The inner side of the wall is pebble-dashed, except the SW quadrant where the original stone is exposed.