USS Mayflower (PY-1), President Harding's yacht, docked the western end of the Navy Yard's Lower Wharf, 1922. The white building at the top of the photo is Building 30. Note the large radio tower just beyond Mayflower's bow. Donation of Lieutenant Gustave Freret, USN (Retired), 1970. U.S. Naval History and Heritage Command Photograph.