I came across this amazing site with old photos of downtown today. I also learned something about old-school manipluation.
Be sure to check out the picture pages.
"This is a more natural view, even though the ubiquitous power and telephone lines have been brushed out of the photo."
"Retouching daytime photographs to make them appear to have been taken at night was a popular custom among postcard-makers in this era. The same moon, clouds and stars show up in many other cards as well."