It isn’t the only glacier at Glacier Bay, but it is one of the most dazzling and active ones in this region of Alaska. Among the 50 other glaciers in the bay, Margerie can be seen moving at a clip of 14 feet per day, which is quite fast for a large piece of frozen land the size of a small city. This glacier calves frequently, so you will have a high likelihood of catching global climate change in action and in all of its astounding power.