Amazing, yet not completely surprising, discoveries of technically sophisticated societies predating previously known civilizations by thousands of years. The nearly desperate attempts to link building sites to imagined ancient religion reeks of more recent prejudice, as if the only reason people can cooperate to build structures must be some banal sky gods.
By all means leave some areas buried. Future technology and, hopefully, advanced scientific reasoning may preserve this history from predation. See Bamiyan site built circa 6th C., destroyed early 21st C.