Horsetail Falls in Yosemite National Park, California. Each February, the falls appear to be "on fire" due to the way the light hits them--but only if conditions are just right during a limited window of time.
Glacier National Park, Montana ... the water really is that blue! The glaciers will be all melted within the next 25 years.....an experience to touch water that had been frozen for 10K years! Fabulous hiking, buses take you right to trail heads and best of all pick you back up too.