Sardinia Su Nuraghe , Barumini No 4
http://slicer93.mbsrv.net/20130127001832.jpg
The basin of this relics has no arch, the entrance is narrow and the passage is like the maze where Stone humans who were made on the basin seemed to get the energy while they were walking the passage.
Was it the Stone human who was the one of lower than the Stone humans with arches？
(You can't distinguish the basin clearly in the above image but you can find clearer image of it below. 【by Takashi】)