The Pyramids in Bosnia (Europe), perhaps in man-made stone or Roman concrete ?
Archaeology
9 mai 2006
The excavations of the first Bosnian (and European) pyramids are underway. They are bringing interesting photos from the excavation site.
To know more visit both internet sites:
Bosnian Pyramid
and also
Archaeological Park: Bosnian Pyramid of the Sun Foundation
From the photos available, the stone material seems to be natural pudding stone or perhaps man-made stone, a type of Roman concrete, called Opus Caementium. I am waiting for more data.