Since 1888, National Geographic magazine has brought the people and places of our immense planet into the homes - and imaginations - of millions of readers. Printed in 37 languages, and instantly recognizable by the yellow-bordered cover, the magazine is revered for its world-class imagery, showcasing the talents of its intrepid photographers. For this exclusive, online-only sale (July 19-29), Christie's and National Geographic have selected 125 iconic pictures in celebration of National Geographic's 125th anniversary. A selection of the proceeds will go toward preserving the archives from which these images were drawn. The sale will include extremely rare prints from Thomas Abercrombie's original Kodachrome negatives, and other photographs never before offered at auction in such large, rich formats. Don't miss the chance to own a piece of this national treasure.