A trip to a remote cave in northern Greenland previously only seen from the air uncovered fascinating information about the area's climate millions of years ago. These images from expedition photograp ...

From the shoreline, Mendenhall Glacier looks like one of Alaska's many spectacular frozen landscapes. Stretching across the Mendenhall Valley near Juneau, its towering walls of ice attract hundreds of ...

Upstairs, right outside my toddler’s room, hangs this striking, blue-blue print of an Icelandic glacier ice cave: the Crystal Ice Cave, circa 2015, long since vanished. My friend Þorri took the image ...