Unique shale and sandstone formations (flysch) found in northern Spain at San Juan de Gaztelugatxe, known as the filming location for Dragonstone in HBO’s The Game of Thrones

Stock photo: Unique shale and sandstone formations (flysch) found in northern Spain at San Juan de Gaztelugatxe, known as the filming location for Dragonstone in HBO’s The Game of Thrones was taken by pepop .