The park's visitor center has a museum that contains object recovered from the mounds collected during two archaeological investigations of the site, first in the 19th century, and later during restoration of the site after World War 1.
The Hopewell Indians crafted pottery in a variety of shapes (more complex in design than earlier cultures) including effigy-shaped pipes and apparel objects made of copper, mica, pipestone and sea shells traded from distant locations. They crafted implements, tools, and spear points from high-quality flint, bone, and imported obsidian.
