[QUOTE=Mustafa]I'd pick Quake I, Duke 3D, Blood and Witchaven. I am still amazed about Quake I graphics. And it runs on DOS.[/QUOTE]

Yeah it is an amazing game with graphics and the good thing is that I have it but I am working on terminator right now so I can't play it right now. I believe that the game Quake was the first to have pure polygons in its engine in the ID Software library and when you think about it is still popular in todays age due to the newer games with even better 3d graphics that are showing up.