According to the leading scientific institutes, the concrete blocks that make up the walls of the Bosnian Pyramid of the Sun are of much better quality than today’s best industrial concrete. Several thousand years after being cast, the only trace of time was visible within the fractures between the blocks, caused by the tectonics long time ago. The archaeological sites on the northern side of the pyramid were opened during the summer of 2006. Photos made in early February 2009, show that the size and structure of the blocks did not change even after the three years of exposure and influence to climatic conditions in central Bosnia and Herzegovina
