I noticed on the first page of this thread an article talking about abandoned train engines in the woods. Here in the Rockies, we have the caboose. I haven't gone to check it out, but a motorcycling buddy told me the story. They were riding motorcycles way back in the mountains, through thick forest. He said that the trail opened up into a small meadow and in the middle of the meadow was an old caboose sitting on one section of train track. Evidently, there was an old railroad spur for a mine that went through that area and when they stopped using the track, it was removed. Nobody knows why the caboose was left. My friend said that you could just barely make out the track bed and they followed it for a while until the underbrush got too thick to continue.
Technically not out in the forest, but we bought an old farmhouse (which was in the forest) and when I was moving items into the attic, I smacked my head on a rafter. I sat down to let the birds swirling around my head clear out and to say a few choice words. I glared up at the rafter and on the backside hanging on some old nails was a Stevens .410 shotgun. It's a little worse for wear - the stock has a 4"x1" piece missing, but it still shoots just fine. I used it as my snake gun when I was out on the tractor. I contacted the previous owner of the house and he said that he had never been in the attic, so who knows how long it had been there.