At minus 55 degrees, Niagara Falls have nearly frozen solid, creating a rare and extreme winter spectacle

From irishoak.com

On both the Canadian and US sides, visitors have been greeted by a surreal landscape. Thick ice clings to railings, trees, and viewing platforms. Mist from the falls freezes on contact with any surface, building up layer after layer of glistening white.

From a distance, the famous Horseshoe Falls resemble a giant frozen curtain. Huge ice shelves cover large parts of the river below, trapping blocks of ice into a vast, slowly shifting mosaic. The water still flows, but much of it is concealed beneath crusted snow and ice.