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Second Hill Of The Stob Pyramids (Bulgaria) Are A Natural Rock Phenomenon (A Set Of Earth Pyramids). The Pyramids Are Rock Formations Up To 12 M (39 Ft) High And Around 40 Cm (16 In) Thick At The Base. They Vary In Shape From Sharp Through Conical To Mushroomlike. Some Of The Columns Are Topped By Flat Stones.