Aurora borealis over Vee Lake near Yellowknife, Canada (@ Michael Ericsson/Getty Images)

Aurora borealis over Vee Lake near Yellowknife, Canada (@ Michael Ericsson/Getty Images)

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Marismas del Odiel Biosphere Reserve, Huelva Province, Andalusia, Spain (@ Martin Ruegner/Getty Images)

Marismas del Odiel Biosphere Reserve, Huelva Province, Andalusia, Spain (@ Martin Ruegner/Getty Images)

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Detail of a banana leaf, Mainau Island, Germany (@ Egon Bömsch /Age fotostock)

Detail of a banana leaf, Mainau Island, Germany (@ Egon Bömsch /Age fotostock)

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Interior of Marble Caves, General Carrera Lake, Chile (@ Danita Delimont/Gallo Images/Getty Images)

Interior of Marble Caves, General Carrera Lake, Chile (@ Danita Delimont/Gallo Images/Getty Images)

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Marjorie McNeely Conservatory at Como Park in St. Paul, Minnesota (@ Joe Mamer/Age fotostock)

Marjorie McNeely Conservatory at Como Park in St. Paul, Minnesota (@ Joe Mamer/Age fotostock)

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Stromatolites at dawn in Shark Bay, Western Australia (@ Frans Lanting/Corbis)

Stromatolites at dawn in Shark Bay, Western Australia (@ Frans Lanting/Corbis)

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Mantles of giant clams in Kingman Reef, Pacific Ocean (@ Brian J. Skerry/Getty Images)

Mantles of giant clams in Kingman Reef, Pacific Ocean (@ Brian J. Skerry/Getty Images)

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