Recently a oldman of my village, Orbaizeta, I told me that some years ago He founded like "stone igloos" in a praeries area where he had walked all his life, but never, until that day he had noticed them.
In the Aralar range (Navarre and Gipuzkoa )exist "Arkuek" which would be the same structures,and the knowlegde about that is quite poor.
A good link about that (spanish):
It has a hole against the rock of the bottom, which probably serve for make fire, and due the form of the hole, prevents rain or snow can enter. Its orientation to the south, protected from the prevailing winds, is perfect.
On the right, there is another one, but unfortunately due to a slide some years ago, now is destroyed.
He does not remember any mention of these structures, and certainly is nothing similar nearby.
Excuse me, for that reason, that does not give more information about its location, until they have been investigated, of which I'll try to take care giving notice to the Aranzadi Science Society, which I am a membership.
Another curious thing is the following picture:
If you look deeper, you can see that there is a horizontal row of rocks, in the middle of the picture, and on the Left, another one rising at an angle of 90 °.
They were once stone walls, whose purpose, like elsewhere in Europe, were to contain wild animals in prehistoric hunting pressured from above, and animals went running to the sinkhole on the right, where stones, arrows and spears thrown from above, kill them.
Finally, I want to show you two photos taken with 7 days difference between April 30 and May 7, from Ibañeta (Santiago´s way).
As you can see, although not to be Irati forest, this is a natural continuation of a forest that does not know place names,and the real extention of the forest is much higher than the 17,100 hectares of Irati. We can see Orreaga Roncesvalles lower right first, and farn away Auritz / Burguete. The mountains to the left are the South of Aezkoa valley.
More words are unnecessary ...