We finished watching six of the most inspirational movies I've ever seen: the six part series that is Ken Burns' The National Parks: America's Best Idea. Each part runs at a little over 2 hours long, full of American history set to the most beautiful scenery in the country.
Starting with the founding of the first national parks, with Yosemite and Yellowstone, and continuing through to the present, the series chronicles the American values that led to the creation of the national park system. And, rather than just painting the picture in broad stokes, the series follows the individuals who fought to establish the parks for the common good as well as those who wanted to exploit the land for private gain.
I can't recommend the series enough. Of course, PBS airs them from time to time, but you can also watch them on Netflix (which is what we did). The visuals are breathtaking, the history illuminating, and the issues as topical today as they were 150 years ago.