Sooo... what's the deal with Road of Bones?

Is it really one disc or 2 discs?  What was the original release of the album's tracklist, and if it's "technically" supposed to be one disc in its original format, what's the second disc made up of and why is it there?  (Obviously this all excludes The Road of Bonus from discussion).

I prophesy disaster wrote: I have the two-disc version of "Road of Bones", which is referred to as a "Special Edition". The track listing is as follows:   CD 1:   1. From the Outside In (7:24) 2. The Road of Bones (8:32) 3. Without Walls (19:15) 4. Ocean (5:55) 5. Until the End (12:00)   CD 2:   1. Knucklehead (8:10) 2. 1312 Overture (4:17) 3. Constellations (12:24) 4. Fall and Rise (7:10) 5. Ten Million Demons (6:10) 6. Hardcore (10:52)   I very highly recommend getting the two-disc version as the second disc is as good as the first disc.