Living in the 21st century, it's easy to take the National Parks, conservation, and environmental philosophy for granted. This wasn't always the case. In the 1800s while the country was in the midst of the Industrial Revolution, Henry David Thoreau and John Muir helped people to realize how important the natural world is. Through their essays, travel writings, and philosophical works, they inspired generations of conservationists, as well as prominent figures from Theodore Roosevelt to Ansel Adams. Publisher Gibbs Smith has created a wonderful series of their works, collecting many of Muir and Thoreau's famous essays into three hardcover volumes. Modern and beautifully designed, the books are sure to motivate future generations to continue the work they started.