Put out to pasture, thinking his political career over, Theodore Roosevelt was atop a mountain when he heard the news: an assassin’s bullet would likely take President McKinley’s life, and make Roosevelt president.

Upon his inauguration shortly after, Teddy brought his lifelong love of the natural world into the White House with him. He found his executive pen a powerful tool, setting aside vast swaths of land as preserves and monuments. And later, as he sought his first term as an elected president, he embarked on the most comprehensive tour of America’s natural wonders any president had ever made: he was struck speechless at the Grand Canyon, met naturalist John Burroughs in Yellowstone, and took “the most important camping trip in history” with John Muir in Yosemite.

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