Oxford University [17] (16+1) If you time it well you can use it to unlock some tech whose Eureka are hard to do.
Ruhr Valley [12] (15 - 3) Just to make my points clear (and I won't downvote it tomorrow), I'm not saying Ruhr Valley is that bad. But [12] is a good place for it - it's not a game-changing wonder but a fetish. Just like VI's Petra, in Civ V it's insanely good, but in VI it's at [12] right now - and it's due to some inherent design problem of Civ VI, namely that you can pump your production as high as you want, but it's just not as efficient as chopping trees. Don't hate me for saying this, blame the designer.
I admit that Broadway [15], Hagia Sophia [13], Országház [15] and University of Sankore [13] are not as good as Ruhr Valley, but that's it. Anything rated over [13] right now other than these four is better than or as good as Ruhr Valley. Meanwhile you can say Ruhr Valley is as good as Petra or Great Zimbabwe, I've no objection to that.
This seems very disingenuous. There are way more than 50 turns between Industrialization and Science Victory, simply because of how much tech you need to unlock – and even more if you're unlucky with how the future era tech tree pans out. This is all the more true because Industrialization is a tech you need to rush if you're doing Science Victory (it is en route for Spaceports, it unlocks Factories & Coal, and it buffs all your mines), meaning you're probably unlocking it comparatively early – and possibly around 100 turns before your eventual victory.
That you win 50 turns after Industrialization is not an exaggeration, not an overstatement, it is just something that's bona fide doable. To see people (not TCBB) say that you got "nothing to do" after Industrialization to justify the value of Ruhr Valley just shows how boring this wonder is. If you really have nothing to do, how about building Oxford University to unlock two techs for free and gain +20% science in one city? Or Bolshoi Theatre for two civics? Or Big Ben to obtain some good amount of gold. Even building some units for the usually "hard" eurekas is a better option than building Ruhr Valley. If you really need 100 turns from Industrialization to science victory, shave 30 turns from your science victory you will find the uselessness of Ruhr Valley. To shave 30 turns:
- If you settle wide enough and have power in all your campuses (with research labs) at one point you should be able to unlock one tech per turn.
- Don't build it, but Renya-gold-buy (or Moksha faith-buy if you have a good amount of faith) Space Port (7200g, and 15% off on Democracy). (See? If you don't build it you won't need Ruhr Valley, and it can be done in any city instead of your Ruhr Valley city.)
- Once you realize that you can buy it, you can settle a city in the south tundra area to chop the projects out.
- You can shave 20 more turns if you take advantage of the Royal Society ability etc.
- Make sure that your spaceship travel 50 light years within 5 turns of unlocking Offworld Mission. If you are lucky you can make it 4 but 5 is always doable.
- Finally and most importantly, don't build Ruhr Valley. It's a trap.
The only time I had nothing to do in late game for science victory is when I do deity OCC. In that case late game is a drag.
Ruhr Valley: not a fan either but the Production is not that wasted. With the +15% Production card, the cost of Ruhr Valley drops to 1080 Production, while the bonus Production can be increased with Production cards (so that +32 can be +48 with +50%).
BTW assuming you got that +32 from my model, your math is incorrect here. When I did that +32 the assumption is a 100 production city, with 10 mine/quarry, so it will gain 10 production from Ruhr Valley, and another 22 from the +20% bonus. So that 22 won't be affected by any other modifiers. Even if you have a +50% (you usually won't), the +32 will become a +37 not a +48. Still making Ruhr Valley pretty bad.
Alhambra [9]
Amundsen-Scott Research Station [8]
Angkor Wat [2]
Apadana [16]
Big Ben [17]
Bolshoi Theatre [17]
Broadway [15]
Casa de Contratación [11]
Chichen Itza [10]
Colosseum [14]
Colossus [6]
Cristo Redentor [17]
Eiffel Tower [20]
Estádio do Maracanã [3]
Forbidden City [17]
Great Library [14]
Great Zimbabwe [14]
Hagia Sophia [13]
Kilwa Kisiwani [23]
Machu Picchu [8]
Mahabodhi Temple [19]
Mausoleum at Halicarnassus [22]
Mont St. Michel [16]
Oracle [22]
Országház [15]
Oxford University [17]
Petra [12]
Potala Palace [13]
Pyramids [23]
Ruhr Valley [12]
St. Basil's Cathedral [16]
Statue of Liberty [17]
Temple of Artemis [19]
Terracotta Army [18]
University of Sankore [13]
Venetian Arsenal [11]