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To me, this one's all about scale.
Anyway what gets me is how come they didn't get up close and take pictures from every side.
In the case of this photo and of the "stone hut", it says that the "hut" is at a distance of 14.6 metres from the camera and the pixel size at that distance is 4 millimetres.
With that pixel size, the "hut" (80 pixels wide) measures some 32 centimetres.
This is the first image where it actually is just rocks for once but the arrangement definitely doesn't seem natural.