I visited the Zimbabwe ruins on safari last year and was told they were created hundreds of thousands of years ago by "gods!" Documentation is found in the oldest writings--Sumerian tablets. An advanced race "fell down" to earth (as even the Bible states) and humankind was created genetically as slave labor by these so called "Annanaki" to mine gold from African sites. There's a fine line of translation between "fallen angels" and what we now call UFO visitors. Seems we're not the first to know about DNA, cloning, space shuttles, etc. There are mines in Africa that are over 50,000 years old. The tour guide claimed the gold was needed by the Annanaki and slave labor was the answer. After all, it's a strenuous ordeal to mine gold from ore; early humankind didn't do it just to wear shiny baubles--they were forced to! I came away from the tour scratching my head, but I admit I was fascinated by the different interpretation.