I love these before & afters. This collection has a nice trick: an old post card is actually in the new picture of the same scene.
Someone could do a "time machine" project for Chapel Hill starting with the thousands of photos that Roland Giduz took, which he has donated to the North Carolina Collection--over 18,000 negatives from 1948 to 1970! For example, during the 1950s Giduz edited the Chapel Hill News Leader. The paper had a weekly "building page" that featured a new Chapel Hill home. Here's an example of what you could do with those cool old photos.