Speculation
In 1990, Danish hobby pilot Preben Hansson observed that the Trelleborgs at Aggersborg, Fyrkat, and Slagelse, and a ringwall at Eskeholm (Samsø, 55°53′08″N 10°39′08″E / 55.88543°N 10.6522°E / 55.88543; 10.6522 (Eskholm, Samsø (not a trelleborg))), appear to be aligned, a kind of Ley line. The theory that the fortresses were planned by prehistoric aviators has been popularized by Erich von Däniken.
Read more about this topic: Viking Ring Fortress
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