In case you've missed them due to holiday celebrations both in-game and out, the Lord of the Rings Online team has been fleshing out the game's Middle-earth with a bunch of articles exploring various locations in the virtual world.
The two most recent exploration pieces focus on the Forges of Khazad-dûm and Nimrodel. These are fairly short pieces that make for a quick read, so check them out if you only have a few moments to spare.
If you have a little more time on your hands, then consider reading their newest hero's guide, which takes you through Zelem-melek, the western half of the heart of Khazad-dûm. It contains six pages of in-depth information, which can also be found after the jump.