The small rocky isle of San Juan de Gaztelugatxe is located on the coast of Biscay, 35km east of Bilbao. It is connected to the mainland by a man-made footbridge with 241 steps. On top of the island stands a 10th century hermitage, built by the Knights Templar which is dedicated to John the Baptist, who allegedly visited the island.

The islands name in Basque has two meanings: gaztelu-aitz, castle rock, or gaztelu-gatxe inaccessible castle.

Game of Thrones fans will recognize the setting, which starred as Dragonstone in season seven.

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