How this happens: These towers are caused when the surface of the of water freezes first, sealing in the water below. As freezing temperatures continue, and that not-yet frozen water trapped below begins to freeze, it expands, creating higher pressure under the ice lid.
Eventually, the pressure will either cause a small crack or opening in the ice where water will start to dribble out -- sort of like squeezing a tube of toothpaste.
However, as that water squeezes out to the surface, it freezes too, creating a small bump of ice on the surface. The pattern repeats and the "bump" grows taller and taller until all the water under the main sheet of ice has frozen. And what you have left is called an ice spike.
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