Fascinating stuff! I've visited Nogales about a half dozen times. I seem to remember the fence being fairly accurately lined up with the monuments in the general vicinity of the port of entry (the fence was probably less than a foot inside US territory), but I also remember seeing a monument suspended from a rocky outcropping on a hill a little to the west of the main crossing area. Another interesting place is Douglas...I think they may have completed the fence construction that was going on in the last couple of years, but when I was there, the only thing separating Douglas from Agua Prieta was a big ditch running directly on top of the border. I had an interesting conversation with a US Border Patrol officer who was complaining about spending hours just sitting in his car looking across the ditch with his binoculars. Still, I think I would have traded jobs!

Bill