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Petra -15 (+1) Game changing wonder when built in the right location. I've played multiple games where after initial scouting I found such a location, went liberty, got my second city in that spot and rush built Petra with a GE from liberty finisher. You immiediately get 2 powerhouse cities instead of one and can get a lot more wonders (or other stuff), which you can now build simultanously.
HG extra food is great. Artemis is not available in BNW so I am kicking it in the teeth. Maybe that's unfair but I only play BNW!