I am on a bit of a quest to discover the most blatantly overpowered combination of game choices that a player could possibly get for any one thing. Things such as production bonuses or golden age time and everything else. I don't know of many but I could imagine a few as being particularly potent. Here are a few examples that I could think of:
Great Person Point Generation via Austria:
Coffeehouse unique building + Garden building + Leaning Tower of Pisa wonder + Declaration of Friendship with Sweden + Avant Garde Freedom tenet
Total: 110% GPP generation in this city, provided there are specialists.
Natural Wonder Tile Yield via Spain:
Spain's UA + One with Nature pantheon + Natural Heritage Sites resolution + Golden Age period
Total: Depends on the natural wonder being worked. I'm not sure if the pantheon and resolution stacks with the UA on golden ages however. GBR will probably be the most powerful, especially since they tend to appear together as two tiles.
Ancient/Classical Wonder Production via Egypt:
Egypt UA + Improved marble resource near city + Monument to the Gods pantheon + Aristocracy social policy
Total: Up to 75% production towards wonders in the ancient/classical era.
Great Person Point Generation via Austria:
Coffeehouse unique building + Garden building + Leaning Tower of Pisa wonder + Declaration of Friendship with Sweden + Avant Garde Freedom tenet
Total: 110% GPP generation in this city, provided there are specialists.
Natural Wonder Tile Yield via Spain:
Spain's UA + One with Nature pantheon + Natural Heritage Sites resolution + Golden Age period
Total: Depends on the natural wonder being worked. I'm not sure if the pantheon and resolution stacks with the UA on golden ages however. GBR will probably be the most powerful, especially since they tend to appear together as two tiles.
Ancient/Classical Wonder Production via Egypt:
Egypt UA + Improved marble resource near city + Monument to the Gods pantheon + Aristocracy social policy
Total: Up to 75% production towards wonders in the ancient/classical era.