Entrance to a cave with Sacred Graal, "that planet of X" - as soon as inhabitants of Bosnia and Herzegovina do not call a huge stone sphere of the unclear origin found by local travelers in the wood near the city of Zavidovichi.
For today it is called the biggest stone sphere in Europe. One consider it as work human, others doubt it. The stone sphere has radius about 1,2-1,5 meters, and preliminary tests show that it can weigh more than 30 tons. To it similar educations found in Costa Rica, in the Arctic, in the Irkutsk region, but all of them were much the smaller sizes. Archeologists considered the previous finds man-made, cut of a stone from 200 to 1500 B.C. Mission and circumstances of creation a petrosfer (prehistoric stone spheres) still represent a riddle for scientists. Some assume that representatives of ancient civilizations made them as symbols of celestial bodies or differentiations between land tenure.