The only way in which something like this will be useful is if, for some reason, civilisation collapses but humans survive. (If humans don't survive then 10,000

The only way in which something like this will be useful is if, for some reason, civilisation collapses but humans survive. (If humans don't survive then 10,000 years is far too soon to worry about another intelligent species arising.) If that happens, some major catastrophe has undoubtedly already occurred which makes the possible death of a bunch of future-cavemen who happen to start digging in the wrong patch of desert pale in comparison. If we're really worried about this scenario we should worry less about marking specific sites, and more about trying to come up with a way to store all our existing scientific and cultural knowledge in a non-perishable manner, in many places, that can be dug up and hopefully eventually decoded by people of the future. Purely from an avoid-human-suffering point of view, telling people "don't dig here" isn't nearly as valuable as telling them about infectious diseases, and vaccination, and...