https://anamericaninbosnia.blogspot.com/2015/04/trek-to-osijela-hill-in-bosnian-valley.html
An American in Bosnia: Trek to Osijela Hill in the Bosnian Valley of the Pyramids, March 3, 2015
Textured clay construction stones were found on March 3, 2015 on Osijela Hill, which had been thought to be a simple clay quarry for the con...