Ok, I just achieved diplomatic victory with 5CC under Monarch. I was leading in culture with one city passing 10k, but I don't see how you guys do 20k cultral victory on 5CC. The tech pace is just so freakin fast on monarch and above that everyone(including me) starts building spaceships in the late 1600s. I might have been able to pull off a spaceship victory as well, but a win is a win. I had Great Library, Hanging Gardens, Oracle, obser, newton's and sistine chapel in one city also(also with some more modern wonders) and I still only hit 10k. I also have colosses, and shakespear's theatre and a few other but they weren't in the culture-whoring city cause I could not have beaten the computer to them if I put them in the same city.