Stare into the eyes of an Amazon tree snake, explore the inside of a lava tube, and dive into an underwater cave. Find your inner National Geographic Explorer in these photos.

My favorite photographs from Photo of the Day this month have an aura of celebration to them. Sunset Summit Photograph by Alexandros Maragos, National Geographic Your Shot ...

It was just 15 minutes before sunset so I did a quick calculation, determining that by using a three second interval between pictures, I would have 300 photos before the scene got too dark.

In fact, dramatic photos of the Badlands had been circulating prior to the initial dedication of the 50,000-acre national monument in 1939. By the time the park was expanded to its current size ...