Solved
The Great Pyramid Disappeared After Storing
My Great Pyramid just disappeared after storing to replace it again. It is not under any categories. I controlled both devices, made sure they are in sync. After spending so many seasonal currencies ...
This happened to me a while ago. It didn't appear in Landscapes or any other menu. Eventually, I found it was built in Cactus Canyon. Not sure how it got there. Try looking closely at all of your regions and see if it's there.