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Made a giant pit in survival but I am not very creative. What should I build in it?
Build a shao-lin monastery...but upside-down, after all, since you dug a hole all the way to China.
Drop shafts in two opposing corners, soulsand elevators in the other two and connect with water streams to make a carnival ride.
Congratulations, you built the most excessively escape proofed sheep pen possible.
Run a spiral stair around the outside (as a cloister one back from the walls for extra credit) and use this as the center of a branch mine.
Use the removed material to build a similarly sized pillar up to just below build limit and add a penthouse with a glass floor (just to test your guests for acrophobia ).
Seal the walls, make the bottom non-spawnable, and add a roof and you've got a nifty bat farm.
WARNING: I have an extemely "grindy" playstyle; YMMV — if this doesn't seem fun to you, mine what you can from it & bin the rest.