Contemporary archaeogeodesy and archaeoastronomy researchers have demonstrated that the Hopewell and other prehistoric cultures had advanced scientific understandings which they used to create their earthworks for astronomical observations, markings and celebrations. Researchers analyzed the placements, alignments, dimensions, and site-to-site interrelationships of the Hopewell earthworks to understand what had been done. Today, the Ohio Historical Society preserves the Great Circle Earthworks in a public park near downtown Newark, called Mound Builders Park (or the Newark Earthworks) located at 99 Cooper Ave, Newark, Ohio. The area of the Octagon Earthworks had been leased to a country club, but new arrangements in 1997 provide for more public access to it. Later American Indian tribes inhabiting the area at the time of European contact were distant descendants of the Hopewell peoples.