I don't know what happened to the other ancient places, but I do know what happened to Mesa Verde: the Anasazi were aliens, and the mothership returned for them. Okay, I don't really know what happened at Mesa Verde either. Where's Coast-to-Coast radio when you want to discuss these things?
"Where's Coast-to-Coast radio when you want to discuss these things?"
Don't worry. It is broadcasting into your fillings the way it always does.
You are not alone.