This is, unfortunately, a really crappy photo of a really neat find; I was torn as to whether I should even bother with it. Those dim white forms, behind the plexiglass and condensation, are black bear bones, dated to 3000 years ago. Just how they got here is an interesting question; we're quite some distance from any known natural entrances. We're close to an artificial exit tunnel, blasted in the early 1930s, but the bear clearly didn't use that. It's possible that another entrance has since collapsed or otherwise been hidden, and it isn't really impossible that the bear wandered here, lost in utter darkness. Whatever the means of the bear's demise, these bones were only discovered in 1998, meaning that I didn't see them during my first few visits to this monument. See page 24 of the photographic tour for a better shot.
Photo unmodified. May 9, 2013. FlashEarth Location. (Since we're underground, I have only a vague idea where this is with respect to the surface.)