It looks like a tipped over beaker on the map. Darnassus in Teldrassil - the second northernmost building in the Tradesmen's Terrace, southwest of the Warrior's Terrace.Cataclysm There is also one in the Dwarven District in the building across from the bank. It would be visible from the spot in the center where two guards are situated, and behind it is a passage to the Canals. Stormwind City in Elwynn Forest - in the Trade District, slightly to the north, before you get to the Inn.Ironforge in Dun Morogh - between the two passages leading from the main entrance, directly facing the bank across the footbridge.ω ϖ in the Shrine of Two Moons, Vale of Eternal Blossoms. WotLK Look for Reginald Arcfire in the Like Clockwork engineering shop, Dalaran.Note: You can access either auction house (and bank) until you choose a faction. Characters can only access the auction house of the faction they are neutral or better with Aldor or Scryers. TBC Shattrath City in Terrokar Forest, in the Aldor bank ( Horde Auctioneer Braku ) and in the Scryers bank ( Horde Auctioneer Lyrsara ).TBC Silvermoon City in Eversong Woods - one is in the center of the Bazaar the other is in a large building in the middle of the Royal Exchange across from the inn.Undercity in Tirisfal Glades - at all the raised platforms around the middle ring of the city, between the trade center and outer ring.Thunder Bluff in Mulgore - at the two tents on the Lower Rise, near the bank and flight tower.Several more were added in Cataclysm Cataclysm around the city (Valley of Honor and Valley of Strength). Orgrimmar in Durotar - from the main entrance, it's the third building on the right.