Yellowstone, the world’s first national park, tops many travelers’ bucket lists. But unbeknownst to most summer visitors, Yellowstone has a secret season. Under a blanket of snow, the park comes quietly alive each winter as neighborhood wildlife reclaim its old stomping grounds, hot springs bubble and mist in the cool air, and geysers erupt in crystalline steam. Here are 10 transformative winter experiences in Yellowstone National Park.