Grave Creek Mound - Credit: Wikimedia Commons
Grave Creek Mound - Credit: Wikimedia Commons
The Grave Creek Mound in the Ohio River Valley in West Virginia is one of the largest conical-type burial mounds in the United States, now standing high and in diameter. The builders of the site, members of the Adena culture, moved more than 60,000 tons of dirt to create it about 250–150 BC. Read more on Wikipedia
Source: en.wikipedia.org