Frost patterns on a steel beam on a bridge over Mistaya Canyon, Banff National Park, Alberta

Frost patterns on a steel beam on a bridge over Mistaya Canyon, Banff National Park, Alberta

© Darwin Wiggett/All Canada Photos/Corbis

Frost patterns on a steel beam on a bridge over Mistaya Canyon, Banff National Park, Alberta

Frost patterns on a steel beam on a bridge over Mistaya Canyon, Banff National Park, Alberta

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