Here are all the WoW Classic dungeons - including subsequent Classic expansions - and how you powerful you need to be to tackle them.
Classic Dungeons Overview - Wowhead
All Dungeons Accessible in Phase 1
Early WoW(~2003) Dungeons locations sketch. : r/classicwow
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Classic Dungeons Overview - Wowhead
The Ultimate Heroic WotLK Classic Dungeons Guide - CoinLooting
Classic Dungeons Overview - Wowhead
Classic WoW - Class Picking Guide - Best class for PVP / PVE
WotLK Classic Leveling guide - fastest leveling class, dungeons, zones
WoW Classic Dungeons Guide - Epiccarry