It's hard to see because it's so well camouflaged into the background, but it's there: an 1882 Winchester rifle. An archaeologist named Eva Jensen recently found it leaning against a juniper tree in Great Basin National Park in Nevada. It's not clear how it got there, how long it was there, or who it belonged to, although those questions are currently the subject of lots of speculation among historians and gun enthusiasts.
It's fun to think that the rifle could have been left there, propped against the tree, for over 100 years. But one article I read had a reader comment that said (I'm paraphrasing here), "If it had really been there that long, it wouldn't look like the tree; it would be part of the tree." Hmmmmm. In any case, the rifle is now being studied, although the odds of finding out how it got there seem pretty remote. Here's a short audio report on it from All Things Considered: