William H. Jackson was a photographer on the now famous Hayden Geological Survey of the Yellowstone region in 1871, and his images are often cited as an important factor in the campaign to have the area established as a national park. In 1938, at the age of 94, W. J. Jackson returned to the park for a visit, and an old report about his trip offers some fascinating insights into the Hayden Survey and how times have changes in the world of photography.

Fall is a season of transition in the National Park System, from long, hot days with crowded roads and trails, to cooler, crisper weather that beckons you to make a few more trips before winter sets in. Here is the first of four suggestions to jump on now, or to add to your to-do list.

North of Yosemite, Sequoia, Kings Canyon, Joshua Tree, and a host of other national park units in California, you might say Lassen Volcanic National Park gets no respect. You might also say it's a jewel in the rough, one that doesn't draw crowds, instead allowing you to enjoy this incredible landscape in relative solitude. A measure of solitude, of course, when compared to the Yosemite Valley, the Giant Forest, even sections of Death Valley come the cooler winter months.