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
Clue #1 This is used as a marker.
Clue #2 It is made of rocks.
Clue #3 It was made by a human.
This is a rock cairn. Cairns have been built to mark trails, campsites, and other important places. Cairns were even used during ancient times. They can be found all over the world.