Ever since legion released i've wanted to go the instanced Dalaran in the mage class hall, so since i found this bug that allows me to go through any invisible wall with a blink i decided to check it out.
Unfortunately i got a bit dissapointed because Dalaran wasn't solid so i just fell through to the water below where there was nothing interesting.
Anyway, here's an album with some screenshots: Mage class hall/Dalaran - Album on Imgur