When all its roads are closed severe weather conditions temporally dead end roads Yellowstone offers an exclusive window of opportunity to document its landscape and wildlife. I was there to see Old Faithful but visibility was at zero. It snowed for most of three days. In subzero wind chill with the wildlife freezing cold and hungry photography can be dangerous. It requires a high level of white balance skill. Thus the value of these exceptionally rare art pieces found within "Dead of Winter" is a true value.