I'm currently playing a game on a custom map I designed using the map editor. I set it up as a scenario with one very uniquely shaped continent and naval units disabled. It is 1950 and I have yet to make contact with the other civ. I have been researching future tech's for several centuries already and have a few cities that have every improvement built. I control over 75% of the map. Wherever the AI is hiding, there will be no chance that it will present any challenge. It's a little more boring than I thought the map would be.