This wonderful old image from the 1860s shows F St. near the end of the Civil War. The details are quite incredible when you click on the photo. I’m a little confused as to where this is exactly. The building in the background could be either the old patent office of the post office. But, the columns in the photo are Ionic, whereas the column on the old post office are Corinthian and those on the patent office are Doric.
Source: New York Public Library