The flow of water over the falls typically can withstand icy temperatures like those that have frozen much of the country this winter, but Monday's high of 9 degrees Fahrenheit brought Niagara Falls to a standstill - and photographers were there to snap some stunning images of the frozen waterfall.

In January, another record-breaking cold front managed to freeze the mighty falls in a 'polar vortex' that turned the cascading water to ice - and affected about 240 million people in the U.S. and southern Canada.