Giant stone sphere found in Bosnian forest

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He says the sphere, in addition to his earlier claims that Bosnia is home to hidden ancient pyramids linked by underground tunnels, prove the existence of an advanced, lost civilization.

“It would be another proof that Southern Europe, Balkan and Bosnia, in particular, were home for advanced civilizations from distant past and we have no written records about them,” Osmanagich wrote in the blog post announcing the discovery for his non-profit group named The Archaeological Park: Bosnian Pyramid of the Sun Foundation.

Other archaeologists have dismissed Osmanagich’s previous claims about pyramid finds. Anthony Harding, President of the European Association of Archaeologists, described the claims as “complete fantasy.”

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According to the International Business Times, some archaeologists have already dismissed Osmanagich’s sphere discovery saying that the rock was likely created naturally. Mandy Edwards of the University of Manchester's School of Earth, Atmospheric and Environmental Sciences told the Daily Mail that the rock was likely formed by the "precipitation of natural mineral cement within the spaces between sediment grains."

Could Osmanagich's new discovery be manmade?

Stone balls have been discovered around the world and linked to ancient civilizations. There are ancient volcanic stone spheres in western Mexico, stone balls in the small island in Pacific – Isla del Cano, volcanic stone balls on Easter Island, and others in Tunisia, and the Canary Islands.