Wawatam Light in St. Ignace on Lake Huron, Upper Peninsula, Michigan -- Jon Arnold Images/Danita Delimont

Wawatam Light in St. Ignace on Lake Huron, Upper Peninsula, Michigan -- Jon Arnold Images/Danita Delimont

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Saddleback caterpillar on a leaf in the Cockscomb Basin, Belize -- Frans Lanting/Corbis

Saddleback caterpillar on a leaf in the Cockscomb Basin, Belize -- Frans Lanting/Corbis

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Roof of the Stephansdom (St. Stephen’s) Cathedral, Vienna, Austria -- Walter Bibikow/Corbis

Roof of the Stephansdom (St. Stephen’s) Cathedral, Vienna, Austria -- Walter Bibikow/Corbis

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Staghorn coral, Great Barrier Reef, off the coast of Australia -- Frans Lanting/Corbis

Staghorn coral, Great Barrier Reef, off the coast of Australia -- Frans Lanting/Corbis

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Pinnacles of sandstone among orange dunes of the Karnasai Valley, Chad -- George Steinmetz/Corbis

Pinnacles of sandstone among orange dunes of the Karnasai Valley, Chad -- George Steinmetz/Corbis

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Green lacewing eggs -- Charles Melton/Visuals Unlimited

Green lacewing eggs -- Charles Melton/Visuals Unlimited

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Sea walls built off the coast of Happisburgh, England -- Tim Harris

Sea walls built off the coast of Happisburgh, England -- Tim Harris

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