there are several small towns scattered around the island, making it quite evenly populated. the largest are holyhead, llangefni, benllech, menai bridge, and amlwch. beaumaris (welsh: "biwmares"), in the east of the island, features beaumaris castle, built by edward i as part of his bastide town campaign in north wales. beaumaris is a yachting centre, with many boats moored in the bay or off gallows point. the village of newborough (welsh: "niwbwrch"), in the south, created when the townsfolk of llanfaes were relocated to make way for the building of beaumaris castle, includes the site of llys rhosyr, another of the courts of the medieval welsh princes, which features one of the oldest courtrooms in the united kingdom. llangefni is located in the centre and is the island's administrative centre. the town of menai bridge (welsh: "porthaethwy", in the south-east) expanded when the first bridge to the mainland was being built, to accommodate workers and construction. until then, porthaethwy had been one of the principal ferry crossing points from the mainland. a short distance from this town lies bryn celli ddu, a stone age burial mound.