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The polar vortex that has gripped the U.S. and Canada this week has led to some spectacular icy images. The latest come from Niagara Falls, which partially froze Tuesday when the temperature hit a record low of minus 2 degrees.
Aaron Harris, a photographer for Reuters, took several shots of the 167-foot frozen falls Wednesday. The ice formed on the U.S. side of the falls, which straddle the border with Canada.
While unusual, it's not the first time Niagara Falls has frozen. Photographs from the early- and mid-1900s archived at Niagara Falls Public Library appear to show frozen falls, though some experts have questioned their authenticity.