"A sculpture like this can take a master carver years to produce. Front and center are the popular Taoist gods Shou, Lu and Fu — symbols of long life, money, and luck. 'We hope — no, we insist — we can continue to protect these skills,' says Wang Shan, secretary-general of the China Arts and Crafts Association." Brent Stirton/National Geographic hide caption

itoggle caption Brent Stirton/National Geographic

Here's a snapshot from the field as Harrington composed his image of Burnside Bridge — which involved schlepping the huge, fragile camera down a steep incline to get the right perspective. Claire O'Neill (@clairevoyant)/Instagram hide caption

itoggle caption Claire O'Neill (@clairevoyant)/Instagram

Alexander Gardner captured the Confederate dead along the Hagerstown Pike at Antietam. One hundred fifty years later, sorghum lines what is now a paved road. Todd Harrington and Alexander Gardner/Library of Congress hide caption

itoggle caption Todd Harrington and Alexander Gardner/Library of Congress

Alexander Gardner's original caption for this image: "A Lone Grave, on Battle-field of Antietam." Alexander Gardner/Library Of Congress hide caption

itoggle caption Alexander Gardner/Library Of Congress

Charles W. Cushman gazes across the Grand Canyon in Arizona, November 1939 The Charles W. Cushman Photograph Collection/Indiana University hide caption

itoggle caption The Charles W. Cushman Photograph Collection/Indiana University

Charles W. Cushman gazes across the Grand Canyon in Arizona, November 1939 The Charles W. Cushman Photograph Collection/Indiana University hide caption

itoggle caption The Charles W. Cushman Photograph Collection/Indiana University