In Scandinavia, cairns have been used for centuries as trail and sea marks, among other purposes. In Iceland, cairns were often used as markers along the numerous single-file roads or paths that crisscrossed the island; many of these ancient cairns are still standing, although the paths have disappeared.
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Through time, people travelled by foot between fjords and had to pass mountains and heaths by old trails. Such trails crossed the country and all were marked with cairn, waypoints (vörðum). A cairn is a man-made pile (or stack) of stones, 1,5- 3 m. high and distance between them not more then people see the next one in a fog or blissard.