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View of the Heads rocky coastline from Featherbed Nature Reserve, Knysna, Garden Route, Western Cape, South Africa, Africa

View of the Featherbed sea caves and coastline in Featherbed Nature Reserve, Knysna, Garden Route, Western Cape, South Africa, Africa

View from Featherbed coastal walk and coastline in Featherbed Nature Reserve, Knysna, Garden Route, Western Cape, South Africa, Africa

View of visitors viewing stalagmites and stalactites in the interior of Cango Caves, Oudtshoorn, Western Cape, South Africa, Africa

View of stalagmites and stalactites in the interior of Cango Caves, Oudtshoorn, Western Cape, South Africa, Africa

The 1.7 billion year old Elgee sandstone cliffs in Yampi Sound, Kimberley, Western Australia, Australia, Pacific

Aerial view of the Bungle Bungle, Purnululu National Park, UNESCO World Heritage Site, Kimberley, Western Australia, Australia, Pacific

Western whiptail lizard, Aspidoscelis tigris, basking in the sun in Red Rock Canyon State Park, California, USA.

Aerial of the Hamelin Pool stromatolites, Shark Bay, UNESCO World Heritage Site, Western Australia, Australia, Pacific

Aerial of a white sandy beach, West Coast National Park, Western Cape Province, South Africa, Africa

Aerial of the Hamelin Pool stromatolites, Shark Bay, UNESCO World Heritage Site, Western Australia, Australia, Pacific

Aerial of the Hamelin Pool stromatolites, Shark Bay, UNESCO World Heritage Site, Western Australia, Australia, Pacific

Aerial view of the Bungle Bungle, Purnululu National Park, UNESCO World Heritage Site, Kimberley, Western Australia, Australia, Pacific

Kirkjufellsfoss Falls, near the port of Grundarfjordur, Snaefellsnes peninsula, western Iceland, Polar Regions

View of the Heads rocky coastline from Featherbed Nature Reserve, Knysna, Garden Route, Western Cape, South Africa, Africa

View of Dias Beach from lighthouse, Cape of Good Hope Nature Reserve, Cape Town, Western Cape, South Africa, Africa

The Pinnacles limestone formations at sunset contained within Nambung National Park, Western Australia, Australia, Pacific

Aerial of a white sandy beach, West Coast National Park, Western Cape Province, South Africa, Africa

Aerial of the Hamelin Pool stromatolites, Shark Bay, UNESCO World Heritage Site, Western Australia, Australia, Pacific

Limestone pillars in the Pinnacles Desert, Nambung National Park, Western Australia, Australia, Pacific

Aerial view of the Bungle Bungle, Purnululu National Park, UNESCO World Heritage Site, Kimberley, Western Australia, Australia, Pacific

The Pinnacles limestone formations at sunset in Nambung National Park, Western Australia, Australia, Pacific

Limestone pillars in the Pinnacles Desert, Nambung National Park, Western Australia, Australia, Pacific

Aerial of the Hamelin Pool stromatolites, Shark Bay, UNESCO World Heritage Site, Western Australia, Australia, Pacific

The Pinnacles limestone formations at sunset in Nambung National Park, Western Australia, Australia, Pacific

Aerial of a white sandy beach, West Coast National Park, Western Cape Province, South Africa, Africa

The Pinnacles limestone formations at sunset contained within Nambung National Park, Western Australia, Australia, Pacific

Aerial of a white sandy beach, West Coast National Park, Western Cape Province, South Africa, Africa

Aerial of a white sandy beach, West Coast National Park, Western Cape Province, South Africa, Africa

Aerial of a white sandy beach, West Coast National Park, Western Cape Province, South Africa, Africa

The Pinnacles limestone formations at sunset in Nambung National Park, Western Australia, Australia, Pacific

Palm trees at approach to Echidna chasm, Purnululu National Park, UNESCO World Heritage Site, Bungle Bungle, Kimberley, Western Australia, Australia, Pacific

The western end of Katherine Gorge in Nitmiluk National Park, where Katherine River cuts through a sandstone plateau, The Top End, Northern Territory, Australia, Pacific

Western or Wailing Wall, sacred site of Judaism, with the gold Dome of the Rock, sacred site of Islam, behind, in Jerusalem, Israel, Middle East

Thrombolites, a variey of microbialite or living rock that produce oxygen and deposit calcium carbonate, similar to some of the earliest fossil forms of life found on Earth, Lake Clifton, Yalgorup National Park, Mandurah, Western Australia, Australia, Pacific