Surrounded by farmland, a quarry and miles of southwestern Minnesota’s windswept prairie, Jeffers Petroglyphs can be easy to miss. Thousands of years ago, though, this place was a destination. Ancient people traveling here carved their stories into the pinkish-red quartzite that rose 50 feet above the grasslands and stretched for miles. Some images cut into the rock date back 7,000 years, long before the Druids raised Stonehenge or the pharaohs built the pyramids.