@Julsijuls 10 April 2021 more from that month

Granite River Not all archaeologists study artifacts and features left by ancient civilizations. These archaeologists are excavating in the Granite River, on the border between the U.S. state of Minnesota and the Canadian province of Ontario. They examine an iron artifact left by colonial traders only 200-300 years ago. PHOTOGRAPH BY DAVID BOYER, NATIONAL GEOGRAPHIC #Photography