Two years after designation, this UNESCO site sheds its golf course trappingsNEWARK, Ohio (WOSU) — Two years ago, eight earthworks became Ohio’s first UNESCO World Heritage site. At the time, one of those locations, the Octagon Earthworks in Newark, was still being used as a private golf club. In this case, World Heritage makes that clear.”What is a World Heritage site? World Heritage sites are approved by the United Nations Educational, Scientific, and Cultural Organization (UNESCO) World Heritage Committee. In the 1930s, the county deeded ownership of the property to what is now Ohio History Connection, but the golf course remained.