Every so often I get the hankering to go stomp a place that previously rode my ass like Zorro, and I nominate Karazhan as being among the better places to do it. After wiping to heroic Icecrown bosses for a few hours, there's something wonderfully therapeutic about venting your frustrations on the tenants of an older raid, particularly when they cough up 1,000 gold, mounts, enchants, and gear that looks delightfully silly on a level 80.
You remember Kara, right? It's that place that used to be hard.
Doesn't narrow it down? It's the big building occupied by crazy dead people.
Also doesn't narrow it down?
Harumph. The place with the long hallway full of undead concubines?
I see that jogged your memory.