During the first flurries, the vivid green of summer is replaced by a crisp, clean blanket of snow. A perfect time to explore and when you literally can make your mark on the pristine landscape.

Ecologists now study Lassen's landscape to see what the future may ... Heavy snows close most of the main road in winter. But visitors still enjoy snowshoe hikes and cross-country skiing at ...

In winter, surface ice traps the gas ... t yet sophisticated enough to capture that kind of rapid landscape change. But at National Geographic’s request, Katey Walter Anthony and Charles ...