Instances: Levels 50-60
Sunken Temple: For levels 49-55, recommended levels 50+. Located in Swamp of Sorrows, and part of special class quests. Bosses include Atal'arion, Dreamscythe, Weaver, Jammal'an the Prophet, Ogom the Wretched, Morphaz, Hazzas, Avatar of Hakkar, and Shade of Eranikus.
Blackrock Depths: For levels 55-60, recommended levels 56+. Located in Blackrock Mountain, and an extremely long instance. Bosses include Lord Roccor, Bael'Gar, Houndmaster Grebmar, High Interrogator Gerstahn, Ring of Law, Pyromancer Loregrain, General Angerforge, Golem Lord Argelmach, Ribbly Screwspigot, Hurley Blackbreath, Plugger Spazzring, Phalanx, Lord Incendius, Fineous Darkvire, Warder Stilgiss, Ambassador Flamelash, Magmus, Princess Moira Bronzebeard, and Emperor Thaurissan.
Blackrock Spire: For levels 58-60. Located in Blackrock Mountain. Bosses include Highlord Omokk, Shadow Hunter Vosh'gajin, War Master Voone, Mother Smolderweb, Urok Doomhowl, Quartermaster Zigris, Gizrul the Slavener, Halycon, Overlord Wyrmthalak, Pyroguard Emberseer, Warchief Rend Blackhand, Gyth, The Beast, and General Drakkisath.
Dire Maul: For levels 58-60. Located in Feralas. Bosses include Zevrim Thornhoof, Hydrospawn, Lethtendris, Alzzin the Wildshaper, Guard Mol'dar, Stomper Kreeg, Guard Fengus, Guard Slip'kik, Captain Kromcrush, King Gordok, Cho'Rush the Observer, Tendris Warpwood, Illyanna Ravenoak, Magister Kalendris, Immol'thar, and Prince Tortheldrin.
Scholomance: For levels 58-60. Located in Western Plaguelands. Bosses include Kirtonos the Herald, Jandice Barov, Rattlegore, Marduk Blackpool, Vectus, Ras Frostwhisper, Instructor Malicia, Doctor Theolen Krastinov, Lorekeeper Polkelt, The Ravenian, Lord Alexei Barov, Lady Illucia Barov, and Darkmaster Gandling.
Stratholme: For levels 58-60. Located in Eastern Plaguelands, and consists of a "living side" and a "dead side." Bosses include The Unforgiven, Hearthsinger Forresten, Timmy the Cruel, Malor the Zealous, Cannon Master Willey, Archivist Galford, Grand Crusader Dathrohan, Balnazzar, Baroness Anastari, Nerub'enkan, Maleki the Pallid, Magistrate Barthilas, Ramstein the Gorger, and Baron Rivendare.