You got me beat. I have Civ 1, Civ2 (and Civ 2 variants: Call to Power, Test of Time). A friend had Civ 3 when I grew up and we played that and Civ 2 Hot Seat during the summers. That was a long time ago.
Anyways, I got to get into the newer ones. I'll use that link Can_of_corn provided.
Edit: I just remembered I did play Colonization a bit back in the day, that was fun. I might have to get that too. In fact a college history professor actually referenced that in one of my classes. It's funny how much I've learned from playing those games.