National Geographic's 100 best images of the year–curated from 106 photographers, 121 stories, and more than two million photographs. Leonardo’s “Mona Lisa” is believed to depict Lisa ...

A scientist examines an axolotl x-ray at the Center for Research and Advanced Studies of the National Polytechnic Institute in Mexico City. What’s more, understanding axolotl genetics could ...

Two million years ago, on the fringe of some of the northernmost land on Earth just 500 miles from the North Pole, the landscape couldn’t have looked more different from today’s polar desert.