Take an expert-led tour of the petroglyphs (rock carvings) that are thought to be some of the oldest in the Midwest. You will get the rare chance to go beyond the ropes and view carvings under their most favorable viewing conditions: up close and in the morning sun. 10,000 years ago glaciers had retreated from Southwest Minnesota, opening up never-before seen landscape. This tour will be accompanied by a discussion of the archaeology of the earliest people of the Midwest…