Heroic: The Shattered Halls

Where's the entrance to this place? I can't seem to find it on my map... ><

Found it! The location for the entrance is 47/52. Follow the Path of Glory from the East heading West, there is like an archway of rib bones, it looks like, about half way up the front of Hellfire Citadel. If you fly at the level of the walls on either side of the Path of Glory, you will be at the correct level to see it, if viewing your mount from behind. Very easy to clear as an Enhancement Shaman at 85. Clear it and get your achievement. Good amount of items, gold, and cloth for sale or passing to your lower toons.

Note: I forget which patch it was specifically, but keys are no longer required to enter into dungeons.

To get into this HC dungeon u need the Flamewrought Key http://www.wowhead.com/?item=30622

from quartermaster in Honor Hold - must be honored or higher to buy the key! cost me 9G