One of the many different countries HBO's Game of Thrones shoots in is Iceland, which they have traveled to during the harsh winter months in Season 2 and Season 3. The network has released a new featurette that shows the picturesque nature of this normally-frigid country during the balmy summer months, which they used for Season 4. Cast members Rose Leslie (Ygrite), Kristofer Hivju (Tormund), Maisie Williams (Arya Stark), Rory McCann (The Hound) and Gwendoline Christie (Brienne) share their thoughts about this warm climate in Iceland they are not used to. We also hear from director Alex Graves, writer-producer Bryan Cogman, producer Christopher Newman, and location manager Fahad Jabali, who reveals that the geothermal areas in this region supply hot water to the Iceland capitol of Reykjavik and surrounding areas. Go behind-the-scenes to learn more about this unique landscape, before the season premiere airs Sunday, April 6 at 9 PM ET on HBO.