On my friends server I am making a giant tree house/village so far the base is 5 by 5 and up like 100 im building the tree and elaves in creative  (so its a building space but im making it look like a tree so 3 layers of leaves = about 1hour of building) i did  put fire spread off cause 1 fire = no tree no house 

on a singleplayer world i am make a castle/ kingdom with stone brick walls