
A crannog is typically a partially or entirely artificial island, usually built in lakes and estuarine waters of Scotland, Wales, and Ireland. They were used as dwellings over five millennia, from the European Neolithic Period to as late as the 17th/early 18th century [1600×1976]
by Vibrant_Trails
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Im guessing the forts were to protect the winter food supply? and if times are dire enough humans become food as well.