Some random ideas:
Isle of Skye, Scotland (Island wonder)
White Desert, Egypt (Desert Wonder)
Salar De Uyuni, Bolivia (Desert Wonder)
Antelope Canyon, USA (Desert Hill Wonder)
Todra Gorge, Morocco (Desert Hill Wonder)
Serengeti, Tanzania (Grassland Wonder)
Chocolate Hills, Philippines (Grassland Hill Wonder)
Guilin Mountains, China (Grassland Wonder)
Cueva de los Cristales, Mexico (Plains Hill Wonder) I'm not sure how to do caves on the map, but it's one of the most otherworldly places on earth
Huanglong, China (Forest Hill Wonder)
Cedars of God, Lebanon (Forest Hill Wonder)
Sagano Bamboo Forest, Japan (Forest Wonder)