In order by minimum level to enter.

    * The Deadmines - Level Range: 15-21 (10)
    * Ragefire Chasm - Level Range: 15-21 (10)
    * Wailing Caverns - Level Range: 15-25 (10)
    * Shadowfang Keep - Level Range: 16-26 (11)
    * Stormwind Stockade - Level Range: 20-30 (15)
    * Blackfathom Deeps - Level Range: 20-30 (15)
    * Gnomeregan - Level Range: 24-34 (19)
    * The Scarlet Monastery - Graveyard - Level Range: 26-36 (21)
    * The Scarlet Monastery - Library - Level Range: 29-39 (21)
    * The Scarlet Monastery - Armory - Level Range: 32-42 (21)
    * The Scarlet Monastery - Cathedral - Level Range: 35-45 (21)
    * Razorfen Kraul - Level Range: 30-40 (25)
    * Maraudon - Purple Crystals - Level Range: 30-40 (25)
    * Maraudon - Orange Crystals - Level Range: 32-42 (25)
    * Maraudon - Pristine Waters - Level Range: 34-44 (25)
    * Uldaman - Level Range: 35-45 (30)
    * Dire Maul - East - Level Range: 36-46 (31)
    * Scholomance - Level Range: 38-48 (33)
    * Dire Maul - West - Level Range: 39-49 (34)
    * Razorfen Downs - Level Range: 40-50 (35)
    * Dire Maul - North - Level Range: 42-52 (37)
    * Stratholme - Main Gate - Level Range: 42-52 (37)
    * Zul'farrak - Level Range: 44-54 (39)
    * Stratholme - Service Entrance - Level Range: 46-56 (41)
    * Blackrock Depths - Prison - Level Range: 47-57 (42)
    * The Sunken Temple - Level Range: 50-60 (45)
    * Blackrock Depths - Upper City - Level Range: 51-61 (46)
    * Lower Blackrock Spire - Level Range: 55-65 (48)
    * Upper Blackrock Spire - Level Range: 55-65 (48)