Just about every town in the United States has one post office, and a number of them have other federal government buildings. The United States experienced quite a boom in federal building construction during the Great Depression, and many of these structures remain iconic pieces of the built environment. This lesson plan from the Teaching with Historic Places program at the National Park Service looks at the role these structures have played in a variety of communities around the country, including Portland, Oregon, Denver, and Louisville. Like the other lesson plans in this series, this one offers a heady mix of primary documents, key historical questions, and visual evidence for use by students. The lesson is divided into several primary sections, including "Locating the Site: Map", "Determining the Facts", and "Visual Evidence". The lesson plan is rounded out by a series of activities and supplementary resources, and overall, it will be of interest to anyone with a penchant for architecture of United States history.