In 1903, US President Theodore Roosevelt took a camping trip in California's Yosemite Valley with conservationist John Muir. Roosevelt famously loved the outdoors, but Muir had invited him for more than just camping: Yosemite was in...

In the 1930s, hundreds of thousands of Americans were recruited across the United States to protect and preserve the country's forests, parks, and fields. The Civilian Conservation Corps, a voluntary work relief program, was way ahead...