A Wither Cage

To make this cage, you need a block of choice. I am doing cobblestone. If you know how to make the Wither, you should make him. (but leave out the middle head.) If you don't know how, you should follow this. Get four soul sand and arrange it in a T. Then put two wither skeleton skulls on the two outside blocks of soul sand. Then take your block of choice and cover it up so you can't see soul sand or wither skeleton skulls. Go to every side and repeat. Put the last skull in the open spot.
***WARNING*** I have not been able to try t his because I just discovered that the Wither does not spawn in creative mode. I would suggest to get as strong armor as strong as you can get. ***WARNING***