Jeffers Petroglyphs (about 7000 years old, older than Stonehenge) in Minnesota has a line on the petroglyphs that points to the sunrise on the summer solstice. Another site, but I thought about all of the above sites when the guide told us that. It is the only straight line on the rock outcrop that cuts the rock edge to edge.
Jeffers Petroglyphs (about 7000 years old, older than Stonehenge) in Minnesota has a line on the petroglyphs that points to the sunrise on the summer solstice. Another site, but I thought about all of the above sites when the guide told us that. It is the only straight line on the rock outcrop that cuts the rock edge to edge.