Question: where was series 3 of game of thrones filmed

title: Game of Thrones (season 3)
text: The mastermind of the massacre is revealed to be Tywin , who awards the House Frey the Seat of Riverrun and appoints Bolton as the Warden of the North . Theon 's captor is revealed to be Ramsay , Bolton 's bastard who let the former 's men leave Winterfell in exchange for surrendering him . Against Balon 's wishes , Yara decides to rescue Theon . Arya and Sandor kill some Frey soldiers mocking Robb 's death . Arriving in the capital with Brienne , Jaime is reunited with Cersei . In the North , Tarly 's party encounters Bran 's and gives them the Dragonglass weapons before arriving back at Castle Black , where he and Maester Aemon send ravens to alert the Seven Kingdoms about the White Walkers . Being hit several times , Jon still manages to escape from Ygritte and returns to Castle Black . In Dragonstone , Davos helps Gendry escape , while Stannis decides to head north and aid the Watch against the White Walker threat , forgiving the former and keeping him . In Essos , the freed slaves of Yunkai receive Daenerys as their `` mother '' .