Gnomeregan
Built deep within the mountains of Dun Morogh, the wondrous city of Gnomeregan was a testament to the gnomes' intelligence and industry. But when the capital was invaded by troggs, the gnomish high tinker was betrayed by his advisor Sicco Thermaplugg. As a result, Gnomeregan was irradiated, and most of its inhabitants slain. The surviving gnomes fled, vowing to return someday and retake their home.