A staircase to traverse a steep hill of pure obsidian at the Big Obsidian Flow in the Newberry National Volcanic Monument in Central Oregon on a summer day.

A staircase to traverse a steep hill of pure obsidian at the Big Obsidian Flow in the Newberry National Volcanic Monument in Central Oregon on a summer day.

Photo by hddatmyers

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Stock photo: A staircase to traverse a steep hill of pure obsidian at the Big Obsidian Flow in the Newberry National Volcanic Monument in Central Oregon on a summer day. was taken by hddatmyers .