Perhaps the most famous alignment circle in the United States is the Cahokia Woodhenge near St. Louis constructed between 700-1400 CE by Cahokia Indigenous native Americans. But there were an estimated 10,000 other earthen mounds that once were scatter across the mid-west..

In an article from Atlas Obscura (https://www.atlasobscura.com/articles/octagon-earthworks-ohio) by Olivia Young on March 5, 2025:

"Just outside of Ohio’s capital, a wall of earth rises five feet from the smooth ground in a perfect circle,1,000 feet (305m) wide. Standing inside that ring of mounded terra firma today, you can see the Moon rise right where the walls break and an ancient passageway leads to an enormous octagonal arena. Thousands of years ago, the Native Americans who built it would have been standing in that very spot, watching the same celestial scene." This is the position of the lunar standstill, the farthest north that the moon rises in the sky and occurs every lunar cycle of 18.6 years.

"The significance and sophistication of the Octagon Earthworks has been compared to that of Stonehenge and the pyramids in Giza. Despite that, the 2,000-year-old site was leased to a country club and used as a golf course for more than 100 years—up until January 1, 2025. After more than a decade of negotiating the Ohio History Connection (OHC) took over the lease and opened the sacred landmark to the public."

Dr. John Low, director of the Newark Earthworks Center at Ohio State Univ. noted that, "At the start of the 1800s, there were more than 40 tribes in what is now Ohio, including the Shawnee, Kickapoo, and Miami. By 1842, they had all been forcibly removed under the Indian Removal Act." But the indigenous people's vibrant culture and astronomical precision remains in their earthen mounds.  Since 2023 this and other indigenous earthworks have been designated by UNESCO as a World Heritage Site (the Hopewell Ceremonial Earthworks), including the Octagon and Alignment Ring.