In the last part of the 20th century, a handful of archaeologists discovered a collection of symbols carved in stone as petroglyphs that appeared to be writing. Initial dating of these symbols showed that they were made over an extended period time, beginning around 1700 BC, and located on as many as five continents.
In 1999, Viewzone visited and photographed the petroglyphs in Colorado and posted them on the internet for comments. [right: Original image from Colorado enhanced to show details. 37-38'12.59"N 103-35'12.88"W.]