[6] And said to him: If thou be the Son of God, cast thyself down, for it is written: That he hath given his angels charge over thee, and in their hands shall they bear thee up, lest perhaps thou dash thy foot against a stone. [7] Jesus said to him: It is written again: Thou shalt not tempt the Lord thy God. [8] Again the devil took him up into a very high mountain, and shewed him all the kingdoms of the world, and the glory of them, [9] And said to him: All these will I give thee, if falling down thou wilt adore me. [10] Then Jesus saith to him: Begone, Satan: for it is written, The Lord thy God shalt thou adore, and him only shalt thou serve.
Maybe the devil had to take Jesus up to a very high mountain to show him the kingdoms' of the world because the world is flat.