Currently I'm playing a completely forgotten game/gem called Azrael's Tear.
It's sort of a hybrid between System Shock and traditional adventure game, casting you in the role of a futuristic tomb robber equipped with a highly computerized helmet riddled with sensors and varied scanning equipment (an aborted military project), an assault rifle and your own brain. Make no mistake, however - action elements are mostly optional and very minor in this game, the romanticism of the profession of rogue archaeologist is also absent, along with acrobatics, rolling boulders and pair of large, polyhedral bewbs - here you're member of a newly arisen (due to tectonic upheaval unearthing many previously unknown sites, combined with availability of aforementioned hi-tech gear) caste of individuals, who are in it for profit and have no compunctions about making lives of the competition nasty, brutish and short.
Your adventure starts with you entering a site in Scotland which is evidenced to be a probable resting place of Holy Grail. The plot, however, seems to be very different and much darker than the usual fare - as far as I can tell at this moment. There is a lot of emphasis on dialogue (which doesn't boil down to just exploring dialogue trees), atmosphere, and the game seems to incorporate a lot of choices - from what I've heard, there are several different possible endings. The helmet's capabilities are put to good use as well, as constant textual feedback you receive through your HUD and consisting of results of various scans as well as the computer interpretation of various data expands your senses far beyond those of an ordinary man.
From more technical side, the game was released in 1996, is fully 3D, has excellent voice acting, midi music of I_can't_believe_it_isn't_cd_audio quality, and will make your computer cry blood when ran in DOSBox. On the other hand running it natively makes it work at mental pace, so you'd do best by sticking with DOSBox and purchasing sizeable amount of liquid helium to help your CPU cope with this new challenge.