Photos show how FDR's 'tree army' helped shape America's national parks — and how the NPS has changed since

Source: Business Insider

Members of the Civilian Conservation Corps (CCC) at a camp in Oregon. CORBIS/Corbis via Getty ImagesThe National Park Service, created by President Woodrow Wilson, turned 110 years old on August 25. Its 12,600 full-time employees oversee 85 million acres and manage a multibillion-dollar budget.