The haunting winter landscape in Yellowstone National Park is different from most other winter landscape scenes because of the presence of steam and mists from the thermal features throughout the park. When the temperatures are below zero, the steam and mists hang over the landscape like fog and create those mysterious views. In one moment, a tree is visible. In the next, it has almost completely disappeared into the whiteness. Hayden Valley is almost devoid of trees in some areas and while the snow covered sculpted hills create interest of their own, when a single tree suddenly appears, your eye is drawn to its lonely silhouette.