From tvguide.com..
In the first image, we see the infamous Wall, which — along with the sacrifices of the dedicated Night Watch — help protect the Seven Kingdoms from the any threats from the northern border. Wildings somehow get through at times.
Next, we get a better look at King's Landing, the capital of Westeros and the Seven Kingdoms, and sits to the south on the Blackwater river. It looks rather regal, doesn't it? Too bad it's so polluted. King's Landing is also the home of the Iron Throne, a throne of swords HBO gave a peek of earlier with Eddard Stark (Sean Bean) sitting upon it.
Finally, we see two pictures of Winterfell, the ancestral castle of House Stark. Can you tell it was built upon hot springs?
Game of Thrones premieres on April 17 at 9/8c on HBO