These photos series are getting quite some attention.
A lot of people have asked if the "old photo" is real or if I had manipulated the photo to add it. The answer is yes, they are real. Those "old photos" are real large posters. They are part of an urban artistic intervention (a very clever and thought provocative one IMO).
As far as I can tell there were 4 of these posters on the same region. I have taken photos of three of them. The fourth was already destroyed when I was doing this photos.
The complete "Now and Then" set can be seen here: www.flickr.com/photos/discaciate/sets/72157625347163768/
Thanks for all the feedback!