Perhaps the better question is why "restore" (to whatever period) at all? What's to be learned about how our ancestors--if indeed these stone pushers WERE in any sense our ancestors--lived, or thought; or about how our own culture developed and why by rerecting the stones? The more I look at these old things, the more I doubt their informative value.

It's probably MORE informative--about our culture--to have pushed in our faces just how ignorantly destructive our known, demonstrable cultural ancestors were. How about some little signs posted over all the buried ones: "Some ignorant clods either allowed this stone to fall down or pushed it over and now no one wants to pay to put it back up"?