A new history and appreciation of national parks

The preservation of America's most majestic land into national parks happened in large part because of the vision of a handful of individuals. A new PBS documentary profiles the parks and the people who fought to keep natural treasures pristine for generations.

Guests

• Dayton Duncan: Writer and documentary filmmaker. He's producer/ writer of the "The National Parks: America's Best Idea." The 12-hour documentary series airs in the fall on PBS.

Resources

• PBS "The National Parks" Web site
• National Park Service