Tollymore Forest Park is the haunted forest, where the White Walkers began their march and were seen by Three Night’s Watchmen. This 600-hectare forest holds a lot much ancient redwood and gothic arches. Here ‘bastard of the boltons’ hunted Theon here. Also, if you remember then stark found out about the direwolves here only.
Downhill beach is used as the location of Dragonstone, where down the hill the seven gods of Westeros were sacrificed by Lady Melisandre.
Castle Ward is located just 40 mins ride from Belfast, this medieval castle was featured in Season 1 when King Robert Baratheon arrives at Winterfell and meet Stark. Also, we get to see the Castle Ward when Bran and Osha were at Winterfell.
Shane’s castle was built in 14th century on the edge of Lough Neagh, this ancient castle was featured in Game of Thrones when Gregor Clegane beheaded a horse and when Jorah steals the boat and takes Tyrion to Daenerys in Meereen.