coolartefact: Dun Aengus - prehistoric fort at the edge of an 100 meter high cliff. The first constr
coolartefact:Dun Aengus - prehistoric fort at the edge of an 100 meter high cliff. The first construction goes back to 1100 BC; around 500 BC, the triple wall defenses were probably built along the western side of fort. Ireland [1000x1000]Source: http://i.imgur.com/kEkzz5q.jpg -- source link
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