My best find was a Honda Hobbit on the side of the road on top of a junk pile.
I saw a Honda XR100R sitting in someones field of junk, on top of a junk cargo van. I tried my best to figure out who owned it but never could determine where it came from. That was several years ago, i would be willing to bet its still there.
I also know where someone took an old italian moped and mounted it on a pole in their front yard. It might double as their mail box. Still has the engine on it and all. Its solid rust now.