Subterranean royal dwarven crypts and magma-flooded halls beneath Old Ironforge (Entrance at 27.6, 47.8). Invaded by Dark Iron forces led by Durgen Dirgehammer.
Blighted royal crypts and necromantic catacombs beneath the Capital City of Lordaeron (Undercity entrance at 72.4, 11.4), home to Witherfang, The Baron, The Abandoned, Rath'mael, Bjork, and Viktor the Vile.
Volcanic rift beneath Orgrimmar's Cleft of Shadow infiltrated by the Searing Blade cult.
Secret subterranean headquarters of the Defias Brotherhood beneath Moonbrook in Westfall, culminating in Ironclad Cove and Edwin VanCleef's juggernaut.
Labyrinthine underground caverns in The Barrens corrupted by the Fanglords and the Emerald Nightmare.
Overrun Titan dig site and primordial marshland caverns in central Wetlands (Entrance at 47.8, 56.2), guarded by Saltspine, Shadetooth, Highland Horror, and the awakened Relic Guardian.
Haunted fortress overlooking Pyrewood Village in Silverpine Forest, ruled by Archmage Arugal and his Worgen pack.
Sunken Night Elf temple of Elune on the Zoram Strand in Ashenvale, occupied by the Twilight's Hammer and Aku'mai.
High-security prison complex beneath Stormwind City seized in a violent inmate uprising led by Bazil Thredd.
Spell-shattered streets, Violet Hold ruins, and ley-line sanctums beneath the arcane dome in Alterac Mountains (Entrance at 8.5, 59.2), featuring 9 encounters culminating in the Shade of the Archmage.
Four-winged bastion of the fanatical Scarlet Crusade in Tirisfal Glades: Graveyard, Library, Armory, and Cathedral.
Irradiated technological capital of the Gnomes in Dun Morogh, usurped by Mekgineer Thermaplugg and trogg invaders.
Thorny quilboar stronghold in the southern Barrens ruled by Charlga Razorflank and the Death's Head tribe.
Submerged ancient troll and naga temple ruins in WoW: Forever, ruled by Zul'Alai, Var'Taka, Deathless Marrow, and Min'loth the Serpent.
Scourge-infested bone spire in the southern Barrens ruled by the lich Amnennar the Coldbringer.
Ancient Titan subterranean vault in the Badlands holding the Discs of Norgannon and the stone watcher Archaedas.
Sun-scorched Sandfury troll city in northwestern Tanaris, home to Chief Ukorz Sandscalp and the hydra Gahz'rilla.
Sacred elemental caverns and waterfalls in Desolace guarded by Princess Theradras at Zaetar's Grave.
The Temple of Atal'Hakkar beneath the Pool of Tears in Swamp of Sorrows, guarded by Jammal'an the Prophet and the Shade of Eranikus.
Sprawling subterranean city of the Dark Iron Dwarves ruled by Emperor Dagran Thaurissan beneath Blackrock Mountain.
Upper and Lower Blackrock Spire fortress of the Dark Horde and Black Dragonflight, ruled by Overlord Wyrmthalak and General Drakkisath.
Ancient Highborne city of Eldre'Thalas in Feralas split into three wings: Warpwood Quarter (East), Capital Gardens (West), and Gordok Commons (North).
Pitch-black catacombs and Upside-Down Sinners beneath Karazhan in Deadwind Pass.
Necromantic academy of the Cult of the Damned beneath Caer Darrow in Western Plaguelands, led by Darkmaster Gandling and Ras Frostwhisper.
Burning northern city of Eastern Plaguelands divided between the Scarlet Bastion (Balnazzar) and the Scourge Slaughter Square (Baron Rivendare).
Rowdy level-60 WoW: Forever tavern instance featuring high-stakes arena brawls against Deathulus and Crushfist Bloodbreaker.