Used to be fairly common to have a dump off the back of folk's houses. There were some long abandoned homes in the woods behind where I grew up and old pulloffs on the road that people used to dump trash over the hill. Lotsa neat stuff -found alotta old glass mostly, but all so common as to not be worth much. It's cool old stuff but essentially still trash.
Even out place in Atlanta had an old garage frame and tons of old car frames and parts overgrown and consumed in the woods. Went digging through it a few times but everything so rusted and gone even if you could make out what it was it wasn't even worth it's weight in scrap.