Never thought about this, but just off the top of my head....
Play a Commercial civ, probably Iroquois for fast growth, Chieftain level, huge pangea map, set the only victory condition as conquest, kill off all civs except for leaving the last one as a 1CC. Cover the whole world with specialist farms and milk the game up to 2049 before killing the last AI town. For wonders, probably build or capture Colossus and Pyramids. Build markets, banks, stock exchanges wherever corruption would allow the gold multipliers to work...no improvements anywhere else or sell the ones no longer needed.
The milking turns sound really, really boring.