Yva Momatiuk & John Eastcott / Iceberg with arches and turrets sculpted by waves and melting of ice, Gerlache Passage, Antarctica

Jose B. Ruiz / Turret and parapet of Granadilla castle, Caceres, Spain

Kim Taylor / Mud crab {Scylla serrata} emerging from its turret amongst mangrove, Trinidad, West Indies.

David Welling / Turret Arch as seen through Window Arch in winter, Arches National Park, Utah, USA

David Welling / Turret Arch as seen through Window Arch in winter, Arches National Park, Utah, USA

David Welling / Looking through Turret Arch, Arches NP, Colorado Plateau, USA

David Welling / Looking through Turret Arch, Arches NP, Colorado Plateau, USA

Tui De Roy / Adelie Penguin (Pygoscelis adeliae) parents bow over newly hatched chick, Turret Point, King George Island, South Shetland Islands

Fred Bavendam / Leaf Barnacle (Pollicipes polymerus) growing on a rocky current swept ledge, Turret Rock, Nakwakto Rapids, British Columbia, Canada

David Noton / Turret Arch seen through Window Arch, Arches National Park, Utah, USA, North America

Jose B. Ruiz / European chameleon {Chamaeleo chamaeleo} looking behind - eye swivel sequence. Spain

Jose B. Ruiz / European chameleon {Chamaeleo chamaeleo} looking forward - eye swivel sequence. Spain