This is a view from the top of Nordrassil all the way down to the southern shore of Uldum. View distance set at 21000 (in-game settings max out at 1250)

Kalmindor, one of the two main lands in WoW. From that map I linked, imagine the camera is by the picture of the octopus in the top right looking down. The top 1/3 of the map is cut off (from the word "The" in "The Veiled Sea" up is out of sight), so the first things you see there are southern Azshara and southern Hyjal. The green forest area just above the black lava area at the bottom is Ashenvale. The orange area to the left is the Orc capital and starting areas.

More detail available here.

Ready for your heads to explode? On the next image I'm hovering above the dark portal and I turned around, and what did I see? Only Eastern Kingdoms and Kalimdor. Specifically the instanced start zones for the Belves and Draenei.

All of the BC zones (Outlands, Azuremyst Isle, Bloodmyst Isle, Ghostlands, Eversong Woods, and Isle of Quel'Danas) are located in the same instance, presumably to make it easier to keep non-Burning Crusade owners out of them. That's why you still need to go through a loading screen to reach any of them from Eastern Kingdoms/Kalimdor. Now the only logical thing to do is go to Silvermoon city and look for Outland to the north, but they did some really strange things with Silvermoon's architecture to pull off some of the visuals. Funky stuff.

Silvermoon City is just a bunch of sprites, basically. Since you only ever see it from the ground, it looks fine. If you manage to get up in the air, you can see it's just a bunch of facades. That's partially why SMC, Ghostlands, and Eversong Woods are non-flyable. They'd have to completely redo SMC from the ground up.