Anguish Fortress

Anguish Fortress (or the Fortress of Anguish) is a fortress of the on. It is the location of the Shadowmoon Burial Grounds. It is here where draenei prisoners are taken to be sacrificed in order to summon void monsters. Ancestors are also being desecrated here. The inside the fortress is locked to outsiders and only with a Fragment of Anguish can one enter.

Trivia

 * In early alpha, the Shadowmoon Overlook occupied the space of this fort.

Speculation
Anguish Fortress may be the same location as Fortress Shadowmoon from Warcraft II: Beyond the Dark Portal, if it was not the Black Temple. calls it Shadowmoon fortress.

Wildhammer Stronghold was built over the ancestral grounds for the Shadowmoon orcs. As the capital of the Shadowmoon and the site of their burial grounds, Anguish Fortress is likely the ancestral ground. As Wildhammer Stronghold is much further south, the site is also possibly the less-notable but still large Shadowmoon village of Shaz'gul.