if you want to see pics of these places i will put links below. First Project is going to To be ICC (Or Ice Crown Citadel) now i got fallen to help me with the design (atleast the blocks i would need and broad statement of where they should be) i will put that below as well! Darnassus: http://www.wowhead.com/zone=1657
Stormwind: http://www.wowhead.com/zone=1519
The Exodar: http://www.wowhead.com/zone=3557
Ironforge: http://www.wowhead.com/zone=1537
Dalaran: http://www.wowhead.com/zone=4395
Shattrath City: http://www.wowhead.com/zone=3703
Black Temple: http://www.wowhead.com/zone=3959
Icc(Ice Crown Citadel): http://www.wowhead.com/zone=4812
as far as block choosing i would go with mainly smooth stone and obsidian since it looks smooth and has that really dark look. For the main door (i think) it looks like it has a gold trim so i would do gold blocks for that, make it look really fancy.
It looks like there is kind of a ring around the spikes so maybe a few iron blocks, im not sure how you could really make a nice point without the whole thing just being massive, maybe iron bars at the top might make it look smaller. The floor looks like it has sort of a small tile design so either stone brick or stone slabs. I would really try to emphasize the depth of the structure like the groove type things that come out, make them go out at least 3 or 4 blocks, the archway thing above the door possibly make the bottom stick out a little more than the top, like it's sinking into the structure, maybe sticking out 2 or 3 blocks at the beginning and go down to 1 at the top. To make the whole thing darker you could almost create a fake sky out of blue/white wool at level 256 so shade would cover up most of the land and darken all the stone.
