FYI it appears these are older: http://en.wikipedia.org/wiki/Megalithic_Temples_of_Malta
Although now I'm in the wikipedia rabbit hole -- looking at fascinating places like this http://en.wikipedia.org/wiki/Knap_of_Howar (potentially older than those Malta temples) and most of the other sites on this: http://en.wikipedia.org/wiki/List_of_the_oldest_buildings_in...