i've got an engaging game going on in 2171AD on a large terra map. the only victory conditions i've got turned on are diplomatic, conquest, and domination.
now, i spent most of my efforts making sure that i own 95% of the new world. this stopped me from conquest in the old world until the 1950s, and as a result of all of this, the game has been dragging on and on and on. i think i've been playing for over 30 hours.. but hell.. it's been FUN. i own 53% of all of the land now and 60% of the population, so i'm getting there.
usually in civ3 i wouldn't even continue playing for the win, but civ4 has somehow managed to make it fun all the way into this very late stage of the game.
i did do some conquering before the advent of astronomy; i destroyed the french.. but the other powers in the new world were just as strong as me, until i was able to bring in reinforcements from the new world (once it was ready to supply the old world).