Well, the things you find out.
There are about 11,000 pingos in the world: ice domes, basically, which can form only where there is permafrost.
Canada has about 1/4 of them, and a special park to protect some of them near Tuktoyaktuk – Pingo National Landmark.
There is evidence of a Pleistocene pingo near Moscow.
Here’s some evidence of one near Tuktoyaktuk.