This winter's polar vortex brought unexpected surprises, including ice covering nearly 88 per cent of the Great Lakes. Along with the ice, strange shapes began to form on what had previously been water.
This week's video shows some of the ice caves on Lake Michigan, which have become unusual sightseeing spots. The strange formations are created when waves and wind push water onto existing ice, resulting in a pile-up effect.
If you have a video you'd like to share, contact us at online-editor(at)canadiangeographic.ca.