The ground force also discovered several buildings used for terrorist operations to include an alleged torture facility complete with chains, shackles, heavy-duty locks similar to those found in detention cell bunkers, windows cemented closed, terrorist propaganda materials, and kerosene heaters.
Link here.
But at least the terrorists didn't waterboard.
UPDATE 9:50: Cent Com has more: a human remains dumping ground was located, which included human skulls and decomposing bodies wrapped in bloody clothing.
UPDATE 10:30: The Cent Com link is from 8/25/07. The Astute Blooger blogged about that here.
UPDATE 10:45: Torture chamber in Sadr City in 2007 here. Other 2007 torture here. PoliBlog had a 2005 report on an insurgent torture house here.