you would not believe how much you would find with a metal-detector. Go to a park after a caravel leaves, and you'll just be beeping like crazy. Parks always turn up a lot of stuff, from watches, rings, knives, zippo's...etc. And when we went on vacations...the metal detectors were always with us. I even have an urge to go buy one and hit a few areas around my house... hehe
Around our house, (in NM) we found chain mail armor from the conquistadors, other ancient odds and ends, some that we can't even figure out what they are, and also after a good rain just walking around we find arrow heads and pottery from the old Anasazi Indians. We have 40 acres there, and they even found a burial grounds on our land. Of course our house is 7 miles from Aztec, where the great kiva's were found, and a lot of the running trails for the messengers going to the surrounding tribes are everywhere...and a few pass thru our land.