The photographs in National Geographic have revealed a world not of sameness however of wondrous diversity. But they have also, increasingly, documented societies and species and landscapes threatened by our urge for homogenization. The magazine’s latter-day explorers are sometimes tasked with photographing places and creatures that a technology later could reside solely in these pages. However, successive takeovers and adjustments in policies coupled with the rise of social media imply it’s not the site it was. However, it’s nonetheless a fantastic place to seek out photos for inspiration. A nice feature for newbies is that many images are uploaded with…