“As far as photo editing goes, this was a serious challenge,” reports NPR in partnership with National Geographic. “National Geographic just released a new book featuring 500 pages of their best photography, which had to be whittled down to a mere nine photos for The Picture Show. That's nothing, though.”

“The real challenge was for National Geographic editors, who had to dig through 11.5 million photos spanning the 120 years of their photographic history.”

All photos via NPR.org. See the entire story here.

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