Iconic photos in National Geographic auction

In this 1998 photo provided by National Geographic via Christie's Auction House, Huli Tribesman, in Papua New Guinea are shown. The photo is among a small selection of the National Geographic Society's most indelible photographs that will be sold at Christie's next month at an auction -- titled "The National Geographic Collection: The Art of Exploration" -- expected to bring about $3 million.

All images are copyright of the National Geographic Society.

Credit: AP Photo/National Geographic, Jodi Cobb