It’s on a Petra desert during a GA... whatevs. That tends to happen when you can’t choose the tiles the landmark appears on. One of the other 2 landmarks in my empire is on tundra. Sure, you can go Artistry and knowledge through devotion. You could even play Egypt! But all those also boost GPTIs by the same amount. However, I can’t help but notice that GPTIs are useful without me having to orient my ENTIRE playstyle around them first.