Weekly Photo Challenge: Out of this World

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great sand dunes national park, postaday, weekly photo challenge

The URL for this challenge is: https://dailypost.wordpress.com/photo-challenges/out-of-this-world/

I took the following photo at Great Sand Dunes National Park in Colorado almost three years ago. Looking at it now, I am struck by the straight line outlining the dune in the middle of the picture. It seems to be drawn not by the wind and other forces of nature but by some unnatural being.

Great Sand Dunes National Park.