Last year marked the 150th anniversary of the start of the American Civil War, a milestone commemorated by The Atlantic in a special issue (now available online). Although photography was still in its infancy, war correspondents produced thousands of images, bringing the harsh realities of the frontlines to those on the home front in a new and visceral way. As brother fought brother and the nation's future grew uncertain, the public appetite for information was fed by these images from the trenches, rivers, farms, and cities that became fields of battle. Today's collection is part 1 of 3, covering the places of the Civil War: the battleships, prisons, hospitals, urban centers, and rural pastures where history was made. Tomorrow's installment features some of the people involved in the conflict, and on Friday I'll be sharing some of the amazing three-dimensional stereographs of the war. Keep in mind, as you view these photographs, that they were taken 150 years ago -- providing a glimpse of a United States that was only 85 years old at the time.