If you build 2 World Wonders in a city, what happens when you build a third? Does it have no benefit for the city? A negative effect? I have 2 WW in a city and now I a Great Prophet that can build a religious Wonder there like the Church of the Nativity. Will it be a waste? Or can I keep cramming them into my capital? I don't understand the limit the game puts on the # of WW's you can place in one city. Can someone clarify this for me? Thanks.