A stone ring, in Ireland.
Not that exciting until you learn this is at the Ceide Feilds neolithic site.
And it is something like 4k years old (I think that is about right).
I feel I should say more, but I will save that for another time.
I will add that there is not much in this shot to give a sense of scale, so just remember that each stone would probably take a few stout men to even lift, and are about as long as your arm.
The neolithic types had a serious work ethic.