That's one more reason I miss living in Europe. Not that I was a treasure hunter, but even having buildings and ruins that old around is amazing. Of course, out your way there are the remains of Pueblo settlements but, here in Minnesota, the plains natives left little more than arrow points and petroglyphs.

When i lived in southern Spain, I was a half hour's bike ride away from Roman and Moorish ruins, as well as bronze age cave paintings.