I know its not much but I find it quite fun and pretty cool, I've known about this for quite a while and I used it to have fun back when i was trying to get the gurubashi grand master trinket!
Only certain classes can reach this, and as far as I am aware it requries a mage (mage it works with fear too?) to blink there and then you charge / shadowstep / similar ability or item (like the charge hat from engineering or the hat from uldaman) (or RAF summon)
What you do is first, as a mage, stand like I do on the below picture:
then blink, it might take a couple of tries but you will end up here:
from here you can cast any spell you want on people above you, so sheep a person that runs above you and take him out without him having any idea what hit him! Trust me, I had alot of fun doing this(Also after some practice you will know where to stand when you blink, and you can duel your friends here and rofl at them from under ground
It is also from here you can help others to get below, people can charge or shadowstep to reach you! (Im not sure if other abilitys work too)
extra picture for teh funs:
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