In January 1888, a small group of scientists and enthusiasts founded the National Geographic Society (NGS) with the aim of creating “a society for the increase and diffusion of geographic knowledge." The first issue of the magazine was published in October 1888. Today, 125 years later, the society is one of the largest nonprofit educational and scientific organizations in the world. To mark the occasion, the society is sharing photographs from its archive of more than 11 million images -- photographs that represent some of the most iconic moments in its history. (25 PHOTOS)