A rugged hiking trail winds through massive lava boulders with a mountain in the background at the Big Obsidian Flow in the Newberry National Volcanic Monument in Central Oregon on a fall day.

A rugged hiking trail winds through massive lava boulders with a mountain in the background at the Big Obsidian Flow in the Newberry National Volcanic Monument in Central Oregon on a fall day.

Photo by hddatmyers

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Stock photo: A rugged hiking trail winds through massive lava boulders with a mountain in the background at the Big Obsidian Flow in the Newberry National Volcanic Monument in Central Oregon on a fall day. was taken by hddatmyers .