[JoseCuervo]

As an archaeologist, I thought I would add my two cents. First of all although I don't specialize in Mayan archaeology, many of my friends who do have debunked this all ready, the pyramid the boy seems to have found is actually believed to just be an old once cultivated field. Secondly Phoenix is not in a river valley per say, the Salt River runs through it, but it has a series of canals distributing water thoughout the city, some of which date to 1500 years ago built by the Hohokam people.