Eiffel Tower : 27
Leaning Tower of Pisa - 31
Hubble Space Telescope - 19
Neuschwanstein - 7
Sistine Chapel - 27
Statue of Liberty - 15
Upvote for Neuschwanstein. I'm a warmonger at heart, and this Wonder makes a world of difference to me. I tend to have a lot of cities and go Order or Autocracy. My puppets tend to build their own Castles, and I do tend to keep a bunch of puppets around, only annexing as budget for courthouses or Happiness allows. The Castles are going to get built anyways if I play Autocracy, because I need them for Fortified Borders. The amount of Happiness this wonder gives me can make the difference between continuing a campaign to victory, or having to pause to bring Happiness in line. The added Culture is good for resisting ideology pressure, which in the early Modern period could potentially hurt. The Gold is... Well, a lot of gold. I can't think of any other Wonder left on the list that makes such a big difference in my games.
Downvote to Hubble. While I'll build it any time I can, I just really don't like what it does to the metagame overall. It's the nail in the coffin for a science leader's lead. All this Wonder does is make a science runaway even harder to beat as they can build spaceship parts faster and get the techs ~14 turns sooner.
Also, for the sake of the contest I don't want to keep a Wonder in that was accidentally dropped for like 200 votes. Doesn't seem fair.