Bolshoi Theatre [17-3=14] I will build this one in a culture game if I can and have nothing better to do, but I don't think it's particularly powerful. 2 free civics can be great...but it always seems to give me useless and cheap civics I didn't even want. By the time I end up finishing Bolshoi, there are usually a lot of dead-end civics that I have unlocked but have no intention of researching, like Capitalism, Nuclear Program, Totalitarianism, Class Struggle, sometimes Divine Right/Reformed Church or Naval Tradition. Bolshoi invariably ends up giving me 2 of these. The extra slots are okay, but there aren't even as many with this as Broadway/Hermitage/Sydney Opera House.
Statue of Liberty [14+1=15] I've never won a diplomatic victory (seems boring and slow to me), but this is very obviously a key wonder for it. 4 diplomatic points is literally 20% of your total points and will save a dull 30-60 turns of waiting until the next World Congress.
Alhambra [3]
Amundsen-Scott Research Station [10]
Apadana [16]
Big Ben [18]
Bolshoi Theatre [14]
Broadway [6]
Casa de Contratación [11]
Chichen Itza [10]
Colosseum [16]
Cristo Redentor [18]
Eiffel Tower [20]
Forbidden City [19]
Great Library [11]
Great Zimbabwe [6]
Hagia Sophia [10]
Kilwa Kisiwani [23]
Machu Picchu [3]
Mahabodhi Temple [19]
Mausoleum at Halicarnassus [22]
Mont St. Michel [16]
Oracle [23]
Országház [12]
Oxford University [19]
Petra [14]
Potala Palace [15]
Pyramids [23]
Ruhr Valley [14]
St. Basil's Cathedral [16]
Statue of Liberty [15]
Temple of Artemis [20]
Terracotta Army [18]
University of Sankore [7]
Venetian Arsenal [5]
Statue of Liberty [14+1=15] I've never won a diplomatic victory (seems boring and slow to me), but this is very obviously a key wonder for it. 4 diplomatic points is literally 20% of your total points and will save a dull 30-60 turns of waiting until the next World Congress.
Alhambra [3]
Amundsen-Scott Research Station [10]
Apadana [16]
Big Ben [18]
Bolshoi Theatre [14]
Broadway [6]
Casa de Contratación [11]
Chichen Itza [10]
Colosseum [16]
Cristo Redentor [18]
Eiffel Tower [20]
Forbidden City [19]
Great Library [11]
Great Zimbabwe [6]
Hagia Sophia [10]
Kilwa Kisiwani [23]
Machu Picchu [3]
Mahabodhi Temple [19]
Mausoleum at Halicarnassus [22]
Mont St. Michel [16]
Oracle [23]
Országház [12]
Oxford University [19]
Petra [14]
Potala Palace [15]
Pyramids [23]
Ruhr Valley [14]
St. Basil's Cathedral [16]
Statue of Liberty [15]
Temple of Artemis [20]
Terracotta Army [18]
University of Sankore [7]
Venetian Arsenal [5]
An extra wild card slot in your policies can let you do extra card shenanigans and give you some nice combinations like getting both Scripture and Simultaneum while sparing another economic policy slot for something else when doing a faith economy game. AI does pursue it, but not too crazily. Can generally hard build it in a decent production city as soon as you get Printing, which should be early anyway.