Civilization V always crashes on big games

Since bigger is better, I usually want to play on Huge worlds with max number of Civs and City States. After I begin conquering the world and my empire spans about 50 cities, the game begins to crash. The crash usually occurs when I hit "Next turn", but it has also happened when giving unit orders etc.

The crash doesn't happen if I play on "strategic view" where the graphics are much simpler.

I have tried re-installing the game and updated graphics drivers. Otherwise, my computer is powerful enough to play Battlefield 3 and Skyrim on max settings.

Any ideas on how to fix this?

If it isn't occurring in Strategic View then that would indicate it has to do with your GPU(more specifically, the amount of VRAM in your GPU) and RAM on your system.