Pete Oxford / Salt mounds and evaporation ponds (sea salt production plant started in the 1600's and worked by african slaves) Cargill Solar Salt Works, Pekelmeer lagoon, Bonaire, Netherlands Antilles, Caribbean

Jeff Wilson / Pyramid of sea ice catching the first rays of the returning sun in the high Arctic, Svalbard, Spitsbergen, Norway, February 2009. Taken on location for the BBC series, Frozen Planet.

Jeff Wilson / Pyramid of sea ice catching the first rays of the returning sun in the high Arctic, Svalbard, Spitsbergen, Norway, February 2009. Taken on location for the BBC series, Frozen Planet.

Jeff Wilson / Pyramid of sea ice catching the first rays of the returning sun in the high Arctic, Svalbard, Spitsbergen, Norway, February 2009. Taken on location for the BBC series, Frozen Planet.

Nick Upton / Traditional organic hay meadow with a profusion of wild flowers and grasses including Pyramid orchid (Anacamptis pyramidalis) Common spotted orchid (Dactylorhiza fuchsii, Rough hawkbit (Leontodon hisp...

Gerry Ellis / Sandstone blocks of White Pyramid of King Snefru at Dakshur, Egypt

Gerry Ellis / The pyramids of Giza in evening light, Giza, Egypt

Gavin Hellier / Looking up Trans America Pyramid and Columbus Tower, San Francisco, California, USA 2011

Tim Fitzharris / Cottonwood Slough and Pyramid Mountain, Jasper National Park, Alberta, Canada

Andy Trowbridge / Early morning light on the Earl Mountains, from the left, Mt Ngatmamoe (2174m), Mt Flattop (2282m) and Mt Pyramid (2295m), taken from Key Summit (918m); Fiordland National Park, Southland, South Islan...

Georgette Douwma / Black pyramid butterflyfish (Hemitaurichthys zoster) over table coral on shallow reef top. Maldives, Indian Ocean

Jan Hamrsky / Spike-tail Dragonfly larva (Cordulegastridae), hidden in gravel, with apex of abdomen, anal pyramid detail visible. Czech Republic. Controlled conditions.

Yva Momatiuk & John Eastcott / Mine tailings from years of mining for opals near Coober Pedy, South Australia, Australia

Yva Momatiuk & John Eastcott / Mine tailings from years of mining for opals near Coober Pedy, South Australia, Australia

Bryan and Cherry Alexander / Pyramid tent and equipment of the Numis Polar Challenge team who retraced Scott's route using similar equipment. Patriot Hills. Antarctica, January 2006.

Brent Stephenson / Buller's Albatross (Thalassarche bulleri) in flight low over the sea showing upperwing. The Pyramid, Chatham Islands, New Zealand, December.

Brent Stephenson / Buller's Albatross (Thalassarche bulleri) feeding on fish offal on the sea with wings raised. The Pyramid, Chatham Islands, New Zealand, December.

Brent Stephenson / Chatham Albatross (Thalassarche eremita) running along sea surface. The Pyramid, Chatham Islands, New Zealand.

Brent Stephenson / Buller's Albatross (Thalassarce bulleri) in soaring flight showing upperwing. The Pyramid, Chatham Islands, New Zealand, December.

Brent Stephenson / Chatham Albatross (Thalassarche eremita) in flight, portrait. The Pyramid, Chatham Islands, New Zealand, December.

John Waters / View of the Pyramid Complex, Meroe, north Sudan

David Noton / Pyramid Lake and Mountain at dawn, Jasper National Park, Alberta, Canada. September 2009

Aflo / ic-08503 Pyramid butterflyfish {Hemitaurichthys polylepis}

Philippe Clement / The top of a Pyramid of Euseigne showing a hard rock protecting softer rock from erosion, Valais, Switzerland, July 2009

Eric Baccega / Mount Pyramid with reflection in Pyramid Lake, Jasper National Park, Rocky Mountains, Alberta, Canada, September 2009

Eric Baccega / Pyramid Mountain towering above Pyramid Lake with low clouds over forest, Jasper National Park, Rocky Mountains, Alberta, Canada, September 2009

Eric Baccega / Pyramid Mountain towering over Pyramid Lake with low clouds over forest, Jasper National Park, Rocky Mountains, Alberta, Canada, September 2009

Russell Cooper / Pyramidal Orchid (Anacamptis pyramidalis) flower, North Downs, Surrey, UK

Fred Bavendam / Pyramid Butterflyfish (Hemitaurichthys polylepis), Indonesia

Simon Colmer / Pyramid bugle (Ajuga pyramidalis), Sussex, UK

Shattil & Rozinski / Camel with Step pyramid in the background, Zoser, Saqqarah, Egypt, 1989

Shattil & Rozinski / Sun rising over pyramid, Giza, Egypt, 1997

Shattil & Rozinski / Camel beside Step pyramid of Zoser, Saqqarah, Egypt, 1989

Shattil & Rozinski / The Sphinx with Khafre pyramid in the background, Giza, Egypt, 2007

Shattil & Rozinski / The Sphinx with Khafre pyramid in the background, Giza, Egypt, 2007

Tim Fitzharris / Pyramid Lake, Nevada

Tim Fitzharris / Pyramid Mountain and boreal forest reflected in Pyramid Lake, Jasper National Park, Alberta, Canada

Tim Fitzharris / Pyramid Mountain and boreal forest reflected in Patricia Lake, Jasper National Park, Alberta, Canada

Ingo Arndt / Pyramid Clio (Clio pyramidata) portrait, Weddell Sea, Antarctica

Ingo Arndt / Pyramid Clio (Clio pyramidata) portrait, Weddell Sea, Antarctica

Tui De Roy / Chatham Albatross (Thalassarche eremita) downy chick on nest, critically endangered, The Pyramid, Chatham Islands

Tui De Roy / Chatham Albatross (Thalassarche eremita) pair on a cliff edge, critically endangered, The Pyramid, Chatham Islands

Tui De Roy / Chatham Albatross (Thalassarche eremita) on a cliff edge, critically endangered, The Pyramid, Chatham Islands

Tui De Roy / Chatham Albatross (Thalassarche eremita) close up portrait of chick on nest, critically endangered, The Pyramid, Chatham Islands

Tui De Roy / Chatham Albatross (Thalassarche eremita) parent with chick on nest, critically endangered, The Pyramid, Chatham Islands

Tui De Roy / Chatham Albatross (Thalassarche eremita) courting pair, critically endangered, The Pyramid, Chatham Islands

Tui De Roy / Chatham Albatross (Thalassarche eremita) affectionate pair, critically endangered, The Pyramid, Chatham Islands

Tui De Roy / Chatham Albatross (Thalassarche eremita) portrait of two, critically endangered, The Pyramid, Chatham Islands

Tui De Roy / Chatham Albatross (Thalassarche eremita) portrait, critically endangered, The Pyramid, Chatham Islands

Tui De Roy / Chatham Albatross (Thalassarche eremita) portrait, critically endangered, The Pyramid, Chatham Islands

Tui De Roy / Chatham Albatross (Thalassarche eremita) flying, critically endangered, The Pyramid, Chatham Islands

Tui De Roy / Chatham Albatross (Thalassarche eremita) on a cliff edge nesting, critically endangered, The Pyramid, Chatham Islands

Tui De Roy / Chatham Albatross (Thalassarche eremita) pair on a cliff edge, critically endangered, The Pyramid, Chatham Islands

Tui De Roy / Chatham Albatross (Thalassarche eremita) on a cliff edge, critically endangered, The Pyramid, Chatham Islands

Tui De Roy / Chatham Albatross (Thalassarche eremita) pair at nest on a cliff edge, critically endangered, The Pyramid, Chatham Islands

Tui De Roy / Chatham Albatross (Thalassarche eremita) on a cliff edge, critically endangered, The Pyramid, Chatham Islands

Tui De Roy / Chatham Albatross (Thalassarche eremita) on a cliff edge nesting site framed by fogbow, critically endangered, The Pyramid, Chatham Islands

Staffan Widstrand / Bedouin camel rider in front of Pyramid of Djoser, Egypt, North Africa

Daniel Gomez / Pyramid of the Sun, Teotihuacan Aztec archaeological site, Mexico.

Daniel Gomez / Climbing the Pyramid of the Sun, Teotihuacan - Aztec archaeological site, Mexico.

Daniel Gomez / Souvenir seller. Pyramid of the Sun, Teotihuacan - Aztec archaeological site. Mexico.

Daniel Gomez / Pyramid of the Sun, Teotihuacan - Aztec archaeological site. Mexico.

Gavin Hellier / Luzor Hotel and Casinos on 'The Strip', Las Vegas, Nevada, USA

Gerry Ellis / Sandstone blocks of White Pyramid of King Snefru at Dakshur, Egypt

Gerry Ellis / Modern Egyptians riding domesticated camels across desert near the pyramids of Giza at sunset, Cairo, Egypt

Norbert Wu / The Great Sphinx and the Pyramid of Kahfre, Giza, Cairo, Egypt

Norbert Wu / Camel and rider in front of the Pyramids at Giza, Cairo, Egypt

Mitsuaki Iwago / Domestic Cat (Felis catus) statues lined up in the desert with Egyptian pyramids in the background, Egypt

JIM CLARE / Maya monument and temple at Tikal, Guatamala, Central-America

Staffan Widstrand / Egyptian man praying, irrigation methods and pyramid in background, Egypt.

Gavin Hellier / El Castilo pyramid Mayan Ruins at Chichen Itza, Yucatan, Mexico, Central America. Maya Civilization 500 - 900 AD

Tim Fitzharris / Pyramid Mountain and Pyramid Lake, Jasper National Park, Alberta, Canada

Marc Robillard / Granite rocks of Armor's coast in Brittany, France, near Perros Guirec.

Christian Ziegler / Small leaf particles protect the soil under them from erosion, creating tiny pyramids of protected soil, Barro Colorado Island, Panama

Graham Eaton / Smokey Quartz or Cairngorm, SiO2, silicon dioxide, from Brazil

Premaphotos / Pyramid orb weaver spider (Araneus marmoreus pyramidatus) female in her lair beneath leaves, UK

Norbert Wu / The Sphinx and Great Pyramids, Giza, Cairo, Egypt

Barrie Britton / Feral Ginger cat in front of Pyramid {Felis catus} Giza Egypt