Hubbard Glacier, Alaska
This natural ice queen rises 300-400 feet upward to hold court over Disenchantment Bay. The glowing blueness scattered over the surface of North America's largest tidewater glacier reveals the telltale signs of active ice. Always on the move, it is perhaps most famous for the 1986 dance step that sealed off the entrance to Russell Fjord, creating an inland lake and stranding marine creatures. Fortunately, the glacier retreated. Constantly crackling and rumbling, ice breaking off the glacier mass makes it seem a live creature giving birth to a court of baby icebergs ranging in size from watermelons to three-story tall buildings.