The culture is the most prominently known of a number of similar cultures in eastern North America that began mound building ceremonialism at the end of the Archaic period. The geographic range of the Adena sites is centered on central and southern Ohio, with further sites in contiguous areas of the surrounding states of Indiana, Kentucky, West Virginia and Pennsylvania. The importance of the Adena complex comes from its considerable influence on other contemporary cultures and cultures that came after it The Adena culture is seen as the precursor to the traditions of the Hopewell tradition, which are sometimes thought as an elaboration, or zenith, of Adena traditions.