In the past year that I've had my annual National Park pass I've hit 24 national parks, monuments and historic sites. Some I've spent quite a bit of time exploring, and others have been mere afternoon stops on my way to something else. But the one thing that they all have in common is that they've made me more and more curious and interested in my country's national parks. Because of this, I picked up The National Parks: America's Best Idea by Dayton Duncan and Ken Burns to read and learn mor...