I only recently found ways to get outside of Karazhan as a DK, using the typical mount through things glitch. I ended up exploring the map around Kara, and ended up posing in instanced Darkshire for a nice pic -
After drinking all the alcoholic drinks in my bags, I took this atmospheric shot from the outside of Kara -
It's really quite a lovely place, albeit lonely. It's impressive that they have almost all the interior bits shoved into that single tower, which is quite unlike most instances in the game.