Antarctica, ca.1911-1912: a photograph from inside an ice cave by Herbert G. Ponting. Captain Robert Falcon Scott's expedition ship Terra Nova is in the distance.

The photo is one of 11 million tucked away in the massive underground archive of the National Geographic Society. National Geographic is beginning to open the collection to the art market for the first time, and a selection of the images will be displayed in a show next month at Steven Kasher Gallery in Chelsea. More info and a slideshow at nytimes.com. Photo: Herbert G. Ponting/National Geographic Society and Steven Kasher Gallery