![Oldest human-made structure in the Americas is older than the Egyptian pyramids](https://ic-cdn.flipboard.com/futurecdn.net/426741b5a1c375a0977b41eefa4f3b47ae6dab45/_xlarge.jpeg)
The grass-covered mounds represent 11,000 years of human history. To find the oldest known human-made structures in the Americas, you don't need to …
* View the article originally published here. ** More curations: Al Cannistra at San Antonio ONE here.