Nazis’ area of interest also included the Stone Grave, a mysterious object in Ukraine that beckons with its mysteries... Petroglyphs of Kamyana Mohyla are dated from Upper Paleolithic (Kukrek culture) to Medieval, with Stone Age depictions subjected to most archaeological interest. The site encompasses a group of isolated blocks of sandstone, up to twelve meters in height, scattered around an area of some work continued only until 1941, as they were interrupted by World War II. The petroglyphs were made with small hard rocks that easily left marks on the soft sandstone.