I play Civ 1 since 1992/1993 and every time I start a new game it's still a big challenge. I know that in the following days I will feel addicted to this new world I'm creating. It will be harder to think in other things like work and family because in every hour of the day, even when I'm not playing, the game will persistently occupy the back of my mind.
It's fascinating to me as the game is always different. I never play the same way. I love the way geography interferes with my strategy. Being a geographer, this is maybe the thing I love best about Civilization - the combinations of the world map are virtually infinite.
Besides, I love Civ 1 graphics. They are much more abstract than the later versions of this game. I don't want a game full of nice visual effects, 3-d views and stuff like that - that's for children. I want a serious and adult game that gives me an immense intellectual pleasure. Civ 1 does that for me.