The mind-numbing cold of last week's polar vortex has finally let up… for now. But there are still some reminders of how cold it was. Take Niagara Falls. The incredibly cold temperatures caused parts of the 53 metre falls to freeze and the area below the observation area was frozen over.

Check out this amazing video, courtesy Reuters:

There are also some remarkable photos of the frozen falls. Click on any of the pictures below to see a larger version.

Frozen falls

Pretty rainbows. Photo: CP

Frozen falls

Sea of ice. Photo: Randi Deuro/Flickr

Is the polar vortex a new phenomenon? Nope.

“The polar vortex is always there,” David Phillips, Senior Climatologist with Environment Canada explained to Global News. “It’s a permanent feature. It was even there two years ago when we had our warmest winter on record. The thing is, it didn’t leave.

“This time it left home.”

This isn't the first time that Niagara Falls has turned into ice. Look at this picture from the 1930s:

Niagara Falls Winter

Niagara Falls in the 1930s. Photo: Gareth Jones/Flickr

Kind of makes you want to book a flight to Mexico, doesn't it?