The Kensington Runestone is a 202-pound (92 kg) slab of greywacke covered in runes on its face and side. A Swedish immigrant, Olof Ohman, reported that he discovered it in 1898 in the largely rural township of Solem, Douglas County, Minnesota, and named it after the nearest settlement, Kensington.
The origin of these Baigong Pipelines and who built them are still a mystery. Was this any sort of ancient research center? Or some sort of ancient extraterrestrial facility or base?