Wow boasts one of the best and most unique architectural styles for fantasy races, they really treid something unique for many of the groups they portray.
Blizzard go one step further, with all the core races, having a variety of architectural styles both for small settings, cities, but also other factions/sub-factions or sub-races of them giving them a range that really reflects the complexities of what a race would be as a nation.
Which is your favourite?
Human - Stormwind, Theramore, Gilneas, Boralus City, Lordaeron, Dalaran, Wintergarde
Orcish - Orgrimmar, Grommash Hold, Hellfire Citadel, Iron Docks, Black Rock Foundry , Gorramor
Thalassian Elven: Silvermoon, Quel'danas, Fairbreeze Village, Tranquilien, Magisters Terrace, Dawnspire
Night Elven: Suramar, Zin'Azshari, Darnassus, Eldre'thalas, Tel'anor, Shal'anir, Feathermoon/Moonguard/Black Rook, CoEN
Undead: Naxxaramas, Brill, Icecrown Citadel, Deatholme, Ebon Hold, UnderCity,
Troll: Dazar'alor Atal'dazar, Zul'aman, Zul'Gurub, Zul'drak, Echo Isles,
Goblin: Kezan, Undermine, Ratchet, Gadgetzan, Everlook, Bilgewater Harbor
Gnome: Gnomeragon, Mechagon, Ulduar Workshop
Draenei: Exodar City, Shattrath WoD & Outland, Karabor, Auchindouin, Mac'aree, Elodor, Telaar, Embaari
Tauren: Thunderbluff, Highmountain, Taunk'ale, Icemist, Turajo,
Dwarf: Ironforge, Grim Batol, Aries Peak, Thaurissian City, Shadowforge City, Thelsamar. Kharanos
Pandaren: Shrine of the two moons/Seven Stars - all the villages
Titan: Ulduar, Uldaman, Uldir, Seat of the Pantheon, Wyrmest Temple
Ogre: Highmaul, Bladespire citadel
Naga: Zoram strand, Nazjatar, the Eternal Palace.
Elementals Firelands
Vortex Pinnacle
Deepholm
Abyssal Maw
Vrykul
Nerubian (scourge variant)
Tol'vir
Arrakoa: Spires of Arak, Skettis