I have a couple 
- all need massive changes to functionality and layers on top but the core is there?
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Something like Myst but on a global scale, using real locations and landmarks but with added fantasy. As eluded earlier some kind of Indiana Jones affair - following clues and meeting key people from around the world, we discover that the pyramids in Egypt are connected to a mechanism in Machu Picchu and hidden in a system of underground caves and tunnels deep underground is an ancient alien life form that still exists to this day… what are they doing here, why couldn’t we find them before and more importantly what have they been doing with us all this time?
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Populous 3. Could be either an overlord God game, where we terraforming the planet, plant forests, create rivers, mountains and volcanoes to influence the weather and make the planet balanced. Life forms evolve, eventually humans, then villages and cities grow programmatically from conditions we have nurtured…
- Or more like an empire management game. As the World Council leader you need to invest in research for the future of the planet to try and survive the environmental catastrophe we are in now. Build sustainable energy, clean factories, production and shipping logistics. Keep the world running. Maybe a few billion people are better off being left to die off? But where do people get their food and products from? Tax is where the money comes from for the research so hmmm it’s a conundrum. Maybe 3D printing your own products at home, and localised food production is the way? But that food creation will need more workers (but less drivers) and those 3D printers also need electricity! Who’s going to make them cheap enough or will the governments subsidise them?
- Transport Tycoon. Global transport manager. Start in 1800 and see how far you can get. Cities expand if you connect up good links, population moves around to nicest places to live etc. They can add Mars, right?
OK that’s enough lol. There really isn’t anything without huge changes to the system. All you’d be left with is the weather and the potential AI for generating foliage and buildings dynamically. But that would need to be done on local PC’s, not the “same for everyone” on cloud servers so it’s not really possible now I suppose.
With a static world there isn’t much except air races haha