that looks such as … alien’s Crop Circle …
Well, the easiest explanation tend to be the right one…
Naaaa, just soil and plant samples taken by Nordic aliens.
Led Zeppelin had a similar image on one of their CD box sets, which came out a number of years ago. 
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I thought I had explored just about every square foot of the map, but haven’t seen that.
Where is it?
Did you walk around with a shovel? Maybe some places to dig up goodies???
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It is near Rattay, above the executioners house if I remember correctly. And it is beyond where player can go.
I thing that there is some evidence of crop circles from 14th century …
On my garden I have little (approximatelly 3x3 meters) rye field. This year, after a storm, I got small but clear crop circle in there. Im am sure it was caused by rotating wind, something like little tornado. It is also on the edge of forest, so I can imagine some turbulences there. Circle was nice and clear, with standing rye in the middle.