Benoit Stichelbaut / The fort and Sarah Bernhardt Museum on Pointe des Poulains, Belle-Ile en Mer, Morbihan, Brittany, France. July 2008.

Tim Fitzharris / Whaleshead Beach with sea stacks, Oregon

Peter Lewis / Common guillemots (Uria aalge) and Kittiwakes (Rissa tridactyla) on Rock stacks, Farne Islands, Northumberland, UK

Peter Lewis / Common guillemots (Uria aalge) and Kittiwakes (Rissa tridactyla) on Rock stacks, Farne Islands, Northumberland, UK

Peter Lewis / Common guillemots (Uria aalge) and Kittiwakes (Rissa tridactyla) on Rock stacks, Farne Islands, Northumberland, UK

Gary K. Smith / Pleasure craft taking tourists sightseeing along the coast of Dorset, with cliffs and Old Harry's rocks in the background, UK

Jouan Rius / Quida Stacks in Ronas Voe, Shetland Islands, Scotland, UK

Jouan Rius / Quida Stacks in Ronas Voe, Shetland Islands, Scotland, UK

Jouan Rius / Stoer Stack, Sutherland, Highlands, Scotland, UK

Inaki Relanzon / Lighthouse on high steep cliffs near Vik, South Iceland

Inaki Relanzon / Town of Vik, South Coast of Iceland

Paul Hobson / Sea rock/ stack arch near the 12 Apostles, South Australia, Australia

Peter Lewis / The Pinnacles, Studland, Dorset, UK, at dawn,

Peter Lewis / The Pinnacles, Studland, Dorset, UK, at dawn,

Peter Lewis / Cliffs and sea stacks just after sunrise at Freshwater Bay, Isle of Wight, Hampshire, UK,

Peter Lewis / Cliffs and sea stacks just after sunrise at Freshwater Bay, Isle of Wight, Hampshire, UK,

Juan Manuel Borrero / People provide some scale to the large eroded rock stacks at Ciudad Encantada Natural Park, Cuenca, Spain

Juan Manuel Borrero / Rock stacks in Ciudad Encantada Natural Park, Cuenca, Spain

Gary K. Smith / Carrot (Daucus carota) field with straw stacks prior to crop being clamped for winter, Norfolk, England, UK, October

Gary K. Smith / Carrot (Daucus carota) field with straw stacks prior to crop being clamped for winter, Norfolk, England, UK, October

Juan Manuel Borrero / Boats moored in a bay in Columbretes Island Natural Park, Castellon, Spain

Juan Manuel Borrero / Boats moored in a bay in Columbretes Island Natural Park, Castellon, Spain

Juan Manuel Borrero / Boats moored in a bay in Columbretes Island Natural Park, Castellon, Spain

Theo Allofs / Daisies along coastline with sea stacks in background, Redwood National Park, California

Kirkendall-Spring / View of sea stacks on the Pacific Coast, Olympic NP, Washington, USA

Juan Manuel Borrero / Stacks on the Pacific coast, Paracas National Reserve, Peru

Michael Durham / Irregular basalt projections and sea stacks on Cannon Beach, Oregon

Mike Wilkes / The Needles, chalk rock sea stacks in Alum Bay, Isle of Wight, UK

Tim Fitzharris / Sea stacks at dusk along Bandon Beach with rising moon, Oregon

Tim Fitzharris / Sea stacks at dusk along Bandon Beach, Oregon

Tui De Roy / Northern Gannet (Morus bassanus) enormous and expanding nesting colony on sea stacks and cliffs, Hermaness, Shetland Islands, United Kingdom

Tui De Roy / Northern Gannet (Morus bassanus) enormous and expanding nesting colony on sea stacks and cliffs, Hermaness, Shetland Islands, United Kingdom

Tui De Roy / Northern Gannet (Morus bassanus) enormous and expanding nesting colony on sea stacks and cliffs, Hermaness, Shetland Islands, United Kingdom

Tui De Roy / Northern Gannet (Morus bassanus) enormous and expanding nesting colony on sea stacks and cliffs, Hermaness, Shetland Islands, United Kingdom

Tui De Roy / Northern Gannet (Morus bassanus) enormous and expanding nesting colony on sea stacks and cliffs, Hermaness, Shetland Islands, United Kingdom

Tui De Roy / Osprey (Pandion haliaetus) nests on sea stacks, Gulf Coast, Sea of Cortez, Mexico

Nick Garbutt / Wood stacks anchoring rope ladders used to climb and collect swift nests for soup, Gomantong Caves, Sabah, Borneo.

JIM CLARE / Stacks of Guano ready for shipment on North Chincha Island, Peru

ASHISH & SHANTHI CHANDOLA / Timber depot, Andaman islands, Indian Ocean

David Welling / Sea stacks at sunset, Second Beach, Olympic NP, Washington, USA

Pete Oxford / Stacks of paper made from {Daphne} tree Jungshi factory, Thimphu, Bhutan 2001

David Kjaer / Traditional hay stacks on crofters land Isle of Skye, Scotland

Dave Watts / The Twelve Apostles at sunset, Victoria, Australia

Niall Benvie / Grangemouth complex, Firth of Forth. Scotland. Pollution from chimney stacks.

Fred Bavendam / Little Blue Penguin (Eudyptula minor) pioneers arrive on beach in front of Twelve Apostles sea stacks, Port Campbell, Victoria, Australia

Fred Bavendam / Vegetation and wildflowers at edge of Little Blue Penguin colony, with beach and Twelve Apostles sea stacks beyond, Port Campbell, Victoria, Australia

Tui De Roy / Southwest promontory and adjacent sea stacks, Snares Islands, New Zealand

Tui De Roy / Southwest promontory and adjacent sea stacks, Snares Islands, New Zealand

Nick Upton / Sail rock, Kenting, Taiwan

Tim Edwards / Limestone cliffs and sea stacks. Port Campbell NP, Victoria, Australia

Roberto Rinaldi / Coastline of Lipari, Aeolian islands, Italy. In the background is Vulcano, smoking.

Roberto Rinaldi / Lipari coastline, Aeolian islands north of Sicily, Italy. In the background is Vulcano (also part of the aeolian islands).

Roberto Rinaldi / Coastline of Lipari, Aeolian islands, Italy. In the back ground Vulcano (also part of the aeolian islands).

Yva Momatiuk & John Eastcott / Power station with steam rising from its stacks over desert, Page, Arizona

Yva Momatiuk & John Eastcott / Twelve Apostles limestone stacks, Great Ocean Road, Port Campbell National Park, Victoria, Australia

Yva Momatiuk & John Eastcott / Twelve Apostles limestone stacks, Great Ocean Road, Port Campbell National Park, Victoria, Australia

Colin Monteath / Dawn light over sea stacks off Decanter Bay, Banks Peninsula, Canterbury, New Zealand

Merryn Thomas / Coastal Path near Bantham Bay, with narrow rock stack and Burgh Island in the distance. South Devon, UK. January 2009.

Konrad Wothe / Sea stacks and natural bridges, Cabo San Lucas, Baja California, Mexico

Xi Zhinong / Hay stored in raised stacks to dry, Tibetan village, Yunnan, China