Salar Du Uyuni (Description): A Two Tile Natural Wonder That spawns on tiles next to mountains and/or deserts. It looks like an arid sandy desert valley with the middle being a giant salt deposit mirror that reflects the tie of day in the background.
(Yields): 2 science 1 Production and 1 gold per turn (Per tile)when worked
by population.
(Effect): When the game reaches the modern era (Assuming the same tech
tree as Civ6) Triggers the Tech boost for Flight.
2. Atlantis (I Know This one is technically a myth but come on. Look at The fountain of youth in Civ6) (Description): A One tile natural wonder that spawns in a lake 1-2 tiles away from coast (Must be connected to the coast (Also has a placing bias towards deserts).
(Yields): None... Sorta.
(Effect): When you find this wonder, and no one has done so yet(Next Sentence is what i'm talking about here). you can settle a city center on the wonder tile to gain a city that starts with +2 Science, Culture, Production, Food, Faith, Housing, Amenities, and Tourism per turn on the city center. (The drawback to this is that its either in a lake so it will be a while till you gain land tiles, or you have land tiles...but its most likely desert tiles).
3. Mauna Kea (Description): A three tile triangle formation Volcano wonder with a Medium Eruption rate that spawns in an ocean at least 6 tiles away from the nearest land.
(Yields): Again, None but also yes.
(Effect): When Mauna Kea Erupts (3 Times a game before its dormant) It has around a 50/50 chance to turn the ocean tiles around it to land tiles, that when created start as magma tiles (that will hurt units on them by 20% of health per turn) then 10 turns later become normal land times that have a chance to spawn with the Obsidian Luxury resource on them that provides 1 food, 2 production and 1 faith when unimproved and can be improved with the mine improvement.