Ermita de San Juan de Gaztelugatxe (Bermeo)

It is a 10th-century hermitage and a winding 241-step stone bridge. Sir Francis Drake famously sacked the hermitage in 1593, looting the sanctuary and reportedly throwing the resident hermit off the cliff. More recently, the islet doubled as Dragonstone—Daenerys Targaryen's ancestral stronghold—in Season 7 of the HBO series Game of Thrones.