Scholomance

The Scholomance (SKOH-loh-mance), a vile academy for prospective necromancers of the Scourge, is located in the ruins of the palatial House of Barov, on a rise overlooking the abandoned city of Caer Darrow.

History
The Scholomance was founded by the rogue wizard Kel'Thuzad nearly ten years ago. His Cult of the Damned renovated the ancient crypts beneath Caer Darrow (an old Arathorian fortress) and turned them into a school for necromancy. The Cult used this place to train its mortal agents and prepare to unleash the Plague of Undeath upon Lordaeron. It has been brewing with young talented wizards and adepts all this time. No one in Lordaeron knew. Originally, the Barov family (of Alterac) owned the land and gave it to the Cult in exchange for the Lich King's blessing of immortality. Now the Barovs remain as undead monsters. One of Kel'Thuzad's mightiest agents, the Ravenian, also lives within the recesses of the school — ever ready to devour those students who show any sign of weakness. The lich Ras Frostwhisper rules over the site and guards it for the Scourge, but the mortal necromancer, Darkmaster Gandling, serves as headmaster of the school, succeeding Araj the Summoner who was headmaster after Kel'thuzad.

From Blizzard's Official World Dungeons site:
 * The Scholomance is housed within a series of crypts that lie beneath the ruined keep of Caer Darrow. Once owned by the nobleBarov family, Caer Darrow fell into ruin following the Second War. As the wizard Kel'thuzad enlisted followers for his Cult of the Damned, he would often promise immortality in exchange for serving the Lich King. The Barov family fell to Kel'thuzad's charismatic influence and donated the keep and its crypts to the Scourge. The cultists then killed the Barovs and turned the ancient crypts into a school for necromancy known as the Scholomance. Though Kel'thuzad no longer resides in the crypts, devoted cultists and instructors still remain. The powerful lich, Ras Frostwhisper, rules over the site and guards it in the Scourge's name — while the mortal necromancer, Darkmaster Gandling, serves as the school's insidious headmaster.