Alhambra 19
Big Ben 21
Brandenburg Gate 20 (+1)
Chichen Itza 24
Eiffel Tower 25
Great Library 21
Hagia Sophia 11
Himeji Castle 13
Hanging Gardens 33
Hubble 34
Leaning Tower of Pisa 27
Louvre 27
Machu Picchu 25
Neuschwanstein Castle 14 (-2)
Notre Dame 28
Oracle 33
Petra 24
Porcelain Tower 25
Pyramide 21
Sistine Chapel 19
Statue of Liberty 27
Stonehenge 23
I'll again vote up the Brandenburg Gate. It's been good since Vanilla and is even more so now that you have a use for more than one GG.
Voting down Neuschwanstein Castle. Too difficult to build and the bonus is lackluster. Happiness isn't difficult to come by in the game and building a whole buch of Castles to get it just isn't worth it to most players/civs.
The point is that you take it with the final Honor policy, which gives you maintenance-free happiness buildings that, in the mid-game when happiness is an issue (assuming you don't simply want positive happiness for Golden Ages, which is an underrated effect), allows you to build those instead of Colosseums etc. which will cost you happiness.
I want to like the Opera House, but it's not a strong late wonder. It needs something in addition to the free social policy in the late game to be worth it to anyone not going for a Cultural Victory.
What about 50% extra culture in the city where it's built?
Oh, wait...
Oh, right...Diplomatic Victory is a thing. I forgot it even exists now.
I almost always go for diplo or science.
I disagree with Domination; it's right there with Rocketry and Rocket Artillery is freaking nuts, especially since Stealth Bombers have been moved so far down the tech tree(which was much needed).
Satellites (unlocking Hubble) is the next tech, and takes as much time as two earlier techs along the Combustion path without providing any military tech whatsoever - you may as well go back to research those, since if you've beelined to Rocketry you don't have them. And if you haven't beelined to Rocketry? By the time you get Satellites you don't need the techs Hubble gives you...
Yes, Stealth Bombers are now very late, but do you need them for a Domination victory? If you're that far down the tech tree and still have opponents close enough to you in power that you need stealth bombers to take them out, something is very wrong.
And even going for science victory I've yet to find Hubble being a game-winner - if I'm going to win I'm going to win without it. If I'm not, I'm not going to win with it. You have to be
very close to a rival going for the same win condition for it to be valuable. It's not a bad Wonder by any means - indeed it's pretty perfectly balanced for its place in the tech tree and its victory condition - but it's not one with a game-changing effect. It's a "beat your fastest turn time" Wonder more than a "beat your closest rival" Wonder.
Pisa : I know its useful, but often Pisa = pick an engineer just to build a different wonder. I dunno. Just strikes me as weird. Wish it did something else.
Bear in mind that it has the same effect as a National Epic in every city (except that it's cumulative with National Epic), it's not just "one free Great Person". So, yes, you almost always use it to get a second Wonder (generally the Porcelain Tower as I play), but you still get the bonus from Pisa itself as well.