Each week, we publish a gallery of readers' pictures on a set theme. This week it is "mountains", and we begin with this picture by Christopher John Keogh near the top of Lochnagar in Aberdeenshire.

After last week’s epic winter storm hit Southern California, new satellite photos from NASA Earth Observatory show snow covering the region’s mountains. UCLA climate scientist Daniel Swain ...

Fall colors are painting the North Carolina mountains, and stunning photos give a glimpse into nature’s annual treat. Webcam footage and pictures shared to social media show autumn hues making ...

Each week, we publish a gallery of readers' pictures on a set theme. This week it is "mountains", and we begin with this picture by Christopher John Keogh near the top of Lochnagar in Aberdeenshire.