On Friday, a rare weather phenomenon created an incredible sight at the Grand Canyon.

The canyon was filled with fog due to something known as “temperature inversion,” according to the Grand Canyon National Park Facebook page, which posted photos to its website.

“We are currently experiencing an after Thanksgiving treat,” a photo caption read. “No, it’s not more pumpkin pie. It’s a once in a lifetime, outstanding, crazy, amazing, mind blowing inversion. Enjoy.”

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