mysterious troughs
Mysterious Gotland Troughs
Over a thousand stones scattered throughout the island of Gotland (Gotland), Sweden, in the middle of the Baltic Sea, differ from the rest of the cobblestones with unusual man-made grooves and grooves cut in the smooth and hard surface of the rock. Patterns are always found in groups of several markings engraved side by side, and differ in their length, depth, and width.
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