First person games that aren't necessarily "shooters" -- s/d

If it doesn't feel like battlefield or half life or quake/doom/etc I would love to hear it because frankly I think the first-person market is completely stagnated and new things need to happen with it other than being in the army or murdering aliens. I've yet to play something like System Shock 2, which I've heard is key. Of course there's Oblivion but that's its own little thing I guess. What else is there? Oh yeah and Myst. What have I forgotten?