Oh Buck, you should know by now to stay clear of mountainous terrain. It probably won't end well. Hopefully he won't be falling to a presumed death in an icy river this time around, but why exactly is he going up the mountains in the first place? And where exactly is he? It looks a lot like the Alps, which isn't really too much of a stretch given at least part of the film will be taking place in Germany (see: that airport scene), but it's not definitive. Is this him going back to try and confront his past, as a way of getting back to his former self? Or is he following someone up there? And does this tie into the fight scene between him, Cap and Iron Man? So many questions from such an innocuous shot.