I've always loved first-person accounts of history, and this book certainly fills the bill. W.H. Jackson was a Civil War veteran, artist, photographer, adventurer and world traveler who wrote this autobiography when he was in his nineties. He was a key member of the U.S. geographical expeditions into the largely unknown areas of the west and was the first to photograph Yellowstone, Yosemite, and much of the Southwest. Later in his life, he traveled to Europe and Asia as photographer with another government expedition. He kept a journal throughout all his travels, and this is the basis for his book.
Equally fascinating to me is his account of the evolution of photography, the processes and equipment he used all along the way. I can't even imagine having to use a light-proof tent in the middle of the wilderness to develop glass plate negatives. (Or carrying 400 lbs. of glass plates on a mule, mixing my own chemical solutions from scratch, etc.)
This book stays in my permanent collection because there's just so much in it I'll want to revisit.