These are the dungeon levels, taken from Atlas, in Vanilla WoW:
Ragefire Chasm – Level: 13-18 – Min Level: 8
The Deadmines – Level: 17-24 – Min Level: 10
Wailing Caverns – Level: 17-24 – Min Level: 10
Shadowfang Keep – Level: 22-30 – Min Level: 14
The Stockade – Level: 24-31 – Min Level: 15
Blackfathom Deeps – Level: 24-32 – Min Level: 19
Scarlet Monastery: Graveyard – Level: 26-36 – Min Level: 25
Gnomeregan – Level: 29-38 – Min Level: 19
Razorfen Kraul – Level: 29-38 – Min Level: 19
Scarlet Monastery: Library – Level: 29-39 – Min Level: 21
Scarlet Monastery: Armory – Level: 32-42 – Min Level: 25
Scarlet Monastery: Cathedral – Level: 35-45 – Min Level: 25
Razorfen Dawns – Level: 37-46 – Min Level: 25
Uldaman – Level: 41-51 – Min Level: 30
Zul’Farrak – Level: 44-54 – Min Level: 30
Maraudon – Level: 46-55 – Min Level: 35
Sunken Temple – Level: 50-60 – Min Level: 35
Blackrock Depths – Level: 52-60 – Min Level: 42
Dire Maul East – Level: 55-58 – Min Level: 50
LBRS – Level: 55-60 – Min Level: 55
UBRS – Level: 55-60 – Min Level: 55
Dire Maul West – Level: 57-60 – Min Level: 50
Dire Maul North – Level: 57-60 – Min Level: 50
Stratholme – Level: 58-60 – Min Level: 45
Scholomance – Level: 58-60 – Min Level: 45
Vanilla WoW 