Hey, this is a reupload of my enderman farm including new additions. The enderman farm gives you tons of XP and ender pearls but just 1 hitting the endermen with your fist or other item of choice.
Here Is a nicer looking and safer Enderman Farm, that provides instant levels after 1 minute of hitting endermen. It has a better design and the bridge is fast and safe to get across, with the addition of no endermen walking freely around!

Notes:
-If there are no fences where there should be please place at the bottom of the farm!
-The MCEdit Schematic includes the bridge with command block so could be considered cheating in survival, just remove the button in survival or go into creative and remove the whole command blocks
-In 1.8 and above endermites will spawn but will not attack
-Some string may be missing due to possible problems with MCEdit, most likely not 
-Some endermen may get stuck and glitch in the pistons but this is very rare in this design!
-There is a ladder to the top for maintenance if needed 

Cheers,
                                 ~Dan