Diocletian’s Palace as Dragon Crypt in Meereen
Daenerys locks two of her dragons in the dungeon underneath Meereen.
Source: Winter Is Coming
“The Children” Filming Locations
Game of Thrones episode “The Children” was filmed in Antrim in the United Kingdom, Split in Croatia, and in Iceland.
Lady Hill Quarry as Battle with Skeletons
Bran and his companions are attacked by skeletons.
Source: Winter Is Coming
Magheramorne Quarry as Castle Black
Home of the Nights Watch at the base of The Wall where Jon Snow travels. Photos of the set constructed in the disused quarry can be found here. One of the quarry walls was painted to look like ice, all of the buildings around the courtyard were built (including several interiors) as well as a working elevator.