World of Warcraft: Molten Core
Anyone who played World of Warcraft back in the day remembers its first major raid destination: the Molten Core. Buried deep in the hellish innards of Azeroth, WoW’s hellish hotspot was created by Thaurissan, leader of the Dark Iron Dwarves, during the War of the Three Hammers more than 300 years ago. Banking on a demonic super-weapon to turn the tides against the Bronzebeard and Wildhammer clans, he summoned the Firelord, Ragnaros, from his thousand-year imprisonment under the Redridge Mountains. Think The Hobbit: The Desolation of Smaug, only way, way shorter.
Of course, Ragnaros destroys Thaurissan City (named after yours truly), creating Blackrock Mountain as a place to stash all his elemental servants and enslaved Dark Iron dwarves. Add that to the burning lake of his that transports evil fire elementals into the world and the Molten Core’s a glorified sweatshop and a demonic commuter bus all in one. Bright idea, Thaurissan.