The prehistoric tunnels of Ravna A huge network of underground tunnels, intersections, chambers, and water reservoirs is located under the Bosnian Valley of the Pyramids. The discovery of the labyrinth was predicted by the discoverer of the Bosnian pyramids, Ph.D. Semir Osmanagić in his book in October 2005 Archaeological and Tourist Park Ravne 2 Ravne 2 Archaeological and Tourist Park was officially opened on June 18, 2016. It covers more than 100,000 square meters and is located in Visoko, the center of Bosnia and Herzegovina. The park was created after Dr. Semir Osmanagic bought 15 plots of land, which he combined into one huge area that contained 7 wild landfills and wetlands. After draining the water, planting plants and grass, removing landfills, and setting up park facilities, Visoko got a beautiful park, which Dr. Semir donated to the “Archaeological Park: Bosnian Pyramid of the Sun” Foundation. Tumulus in Vratnica The artificial conical hill is located only 5 km from the Bosnian Pyramid of the Sun. It was built using a combination of two-layer megalithic blocks, clay, and concrete. Its height is 32 meters above the plateau. Megalithic blocks reach a mass of more than 10 tons.