Niagara Falls has been transformed into a winter wonderland as surrounding water and mist turned to ice due to recent sub-zero temperatures. ... Anadolu Agency via Getty Images.

Niagara Falls hasn't fully frozen since ... 2014, 1917, 1912 and 1911 (Picture: Lokman Vural Elibol/Anadolu via Getty Images) Roughly 12,000,000 people visit the falls each year – in day ...