bridge to the gatehouse and portcullis of an old stone medieval castle - beaumaris castle

walkway fortified moat bridge portcullis gatehouse 13th century anglesey beaumaris beaumaris castle britain cadw castell biwmares castle castles coast cymru double-wall edward fortification fortress historic history iron ring island isle james george limestone medieval menai môn mam never build north north wales outer ward owain glynd?r palace royal royal ruin sandstone stone stone walls stronghold symmetry tourism unfinished welsh