***Edit: Please note that an updated, improved, version of this world is available here: A Game of Thrones World
For your gaming pleasure, I present Westeros and Essos - it is a large, unpopulated world with decor, spawners, a few castles (none of the major ones I'm afraid, except the Great Meereen Pyramid), and named lots in the relevant places. The only CC I used is the CAW minor pet spawners available here http://www.modthesims.info/showthread.php?t=460287 (but included in the world, no need to download) and a few terrain paints. (And it's just been brought to my attention...there is a Ship's Mast on one of the lots - the world will install fine without it if you do a Clean Install).
Download for Westeros and Essos: http://www.mediafire.com/?owowk0vb1otk26o
It is vital that you have update 1.42 or later to enable ocean swimming, otherwise this world WILL break your game.
I made it with the following expansion packs: Ambitions, World Adventures, Late Night, Generations, Pets, Seasons, Supernatural, Monte Vista, Barnacle Bay, Dragon Valley, Riverview, Midnight Hollow.
This shows the coastline - it isn't an up to date image (added lots and made a few minor changes), but serves to show scale and outline:
more info and screenshots available here: http://calinselene.wordpress.com/
Hope you enjoy, and please feel free to post some screenshots of your G.O.T simming here .
Oh, one side note... had an idea for a challenge using this world and Daenerys: The purpose of the challenge is to help Daenerys win the Iron Throne using (wait for it...) a zombie army! :P. It would be an open ended challenge and I'm thinking it would be considered met if her army bit and turned say 20 Westeros citizens. There could be an reward item for those who entered and some rules etc. Would anyone we interested in such a challenge? Let me know .

http://mrxsthetic.tumblr.com/post/143993655504/newseas-mhysa-hair-retexture-download

I think I used the ms blue skintone set v3

https://www.thesimsresource.com/downloads/details/category/sims4-skintones/title/skintone-set-v3/id/1346781/

PYXIS natureboy default skin Ramen Female

http://pyxiidis.tumblr.com/post/149624657376/nature-boy-a-skin-by-pyxis-ive-been-getting

remove ea eyelashes mod

http://sssvitlans.tumblr.com/post/160018051549/no-ea-eyelashes

Jonsims face modeleur 3
http://www.jomsimscreations.fr/makeup-sims-4.html
http://www.jomsimscreations.fr/_media/jomsims-face-modeleur-3-zip.zip
S-club 2d eyelashes (one of these, not sure which)
https://www.thesimsresource.com/downloads/details/category/sims4-makeup-female-eyeliner/title/s-club-ll-thesims4-eyelash-02/id/1271924/
https://www.thesimsresource.com/downloads/details/category/sims4-makeup-female-eyeliner/title/s-club-ll-thesims4-eyelash-01-/id/1264425/
tamo eyecrease Basic 10 Eye Bags Set for All
https://tamosim.blogspot.dk/2015/10/ts4-basic-10-eye-bags-set-for-all.html
Kat Von D Shade & Light (Contour Palette) by MAC
http://dreamweaver-sims.tumblr.com/day/2016/07/22/
Pralinesims n03 lipcorners
https://www.thesimsresource.com/downloads/details/category/sims4-makeup-female-skindetails/title/mouth-corners-n03/id/1330957/
pralinesims grunge eyeshadow tint N39
https://www.thesimsresource.com/artists/Pralinesims/downloads/details/category/sims4-makeup-female-eyeshadow/title/grunge-eyeshadow-tint-n39/id/1356830/
blahberry pancake tony eyebrows
https://www.thesimsresource.com/members/Blahberry_Pancake/downloads/details/category/sims4-hair-facial/title/blahberrypancake--toni-eyebrows/id/1373932/
alfsi spark eyes
https://www.thesimsresource.com/downloads/details/category/sims4-makeup-female-costumemakeup/title/spark--eyes-hq/id/1373706/
s4nexus defined mouth
http://sims4nexus.com/?p=7507
Sims 4 nexus defined nose
http://sims4nexus.com/?p=4813
Kijiko ver 2 expansion mesh eyelashes
http://kijiko-catfood.com/3d-lashes-version2/
pralinesims lipstick noe lips n68
https://www.thesimsresource.com/downloads/details/category/sims4-makeup-female-lipstick/title/noe-lips-n68/id/1342064/

Daenerys Targaryen dragon necklace
https://www.thesimsresource.com/downloads/details/category/sims4-accessories-female-necklaces/title/targaryen-necklace-%28female%29/id/1357427/
aenerys Targaryen Blue Cutout Dress Worn in Season 4 by magnolianfarewell
http://magnolianfarewell.tumblr.com/post/142864288414/game-of-thrones-collection-part-1-daenerys
Daenerys Targaryen Meereen Cutout Gown Worn in Season 4 by magnolianfarewell
http://magnolianfarewell.tumblr.com/post/144320923784/game-of-thrones-collection-part-3-daenerys
Daenerys Targaryen Dragonscale Dress by magnolianfarewell
http://magnolianfarewell.tumblr.com/post/146622724904/game-of-thrones-collection-part-6-daenerys
Daenerys Targaryen season 2 Simplified Qarth Gown by magnolianfarewell
http://magnolianfarewell.tumblr.com/post/142974767299/game-of-thrones-collection-part-2-daenerys