Actually, for older teenage kids and adults, there's yet another educational level to this, which I didn't even know about until I saw something on TV about it. Apparently there are "historical" treasure hunters out there. They learn about historical places that used to exist but are now just uninhabited wilderness or maybe public parks and such. They're not historically famous places like Valley Forge or something. Those places don't let you do any metal detecting, I don't think. But at these non-famous places, you can use your metal detector and dig all you want. Since they're obscure places, they may not have already been gone over by others with metal detectors yet. And that means you can sometimes find really interesting things.