The seventh wonder of the world has frozen over as a blistering Arctic blizzard batters the US.
Niagara Falls, which usually features among the world's most stunning sites, has become a winter wasteland thanks to the worst weather disaster in a lifetime to hit the United States this Christmas.
A series of stunning photos show ice sheets and frozen mist rising from the iconic tourist destination, which lies between the borders of Ontario, Canada and New York State.
