Placement of some wonders, especially National Wonders, is also important to how you plan to win.
For example, suppose you're pursuing a cultural victory. As was mentioned above, you then want to build several culture-producing wonders in three cities, which will eventually achieve Legendary status.
One of those cities should contain the Globe Theatre. For a cultural win, this should be your GP farm and therefore should contain the National Epic as well. You want to run as many artist specialists here as possible, and you want it to produce as many Great Artists (for the Great Work-produced 4000 culture points) as possible. For most other victories, you'd pair the NE with Oxford for Great Scientists, but not for cultural.
In addition, you're best off NOT building Heroic Epic, West Point, and/or the Red Cross in one of your three culture-heavy cities, even though they also produce culture. Why? The biggest danger when pursuing a cultural win is that you will fall behind in military production and get attacked. So you need to have at least one city--the Heroic Epic city--constantly producing military units. It can't do that if it's busy with cultural builds.
Anyway, that's just one example. The more I play this game, and the higher the difficulty level, the more time I take with every single decision.