I’ve always wondered what treasures and ancient civilizations are burried under the Sahara.
Me too. Qattara Depression seems like a good place to start, but I also recall (not for the first time, even on FR) seeing a Nat Geog photog of a living olive tree, thousands of years old apparently, within dozens of yards of what was at that time the geographic center of the Sahara. Paintings on cliff faces showing agricultural activity have been identified, and they are, uh, pretty old. :’)