Central fortress of Dalaran which housed the Eye of Dalaran, the Chamber of Air, and great spell library of the Kirin Tor, the ruling mage class of Dalaran.
The city of Dalaran; the tall spire in the centre (with the rotating crystals) is the Violet Citadel
It was the "capital" of the nation of dalaran and was located at Cross IslandTemplate:Cite.
The Violet Citadel as seen in Warcraft III