All the castles on HBO's 'Game of Thrones,' explained. Pyke is the stronghold of House Greyjoy and is located on an island of the same name in the Iron Islands, off the western coast of Westeros.

The Eyrie is seen in Game of Thrones as the most impregnable castle in Westeros. The Eyrie's layout may keep invaders out, but it struggles with long-term defense. Moat Cailin and Casterly Rock ...