Three years I went to this exhibit at the International Center of Photography to see photographs by Eugene Atget and Christopher Rauschenberg. Atget documented Paris in the early 20th century, as it began to lose many of the old cobble streets and facades to modernization; Rauschenberg rephotographed some of the same streetscapes at the end of the 20th century. A quick search around the web finds many others have done the same.
I'm thinking of Paris, past and present, as Rob and I prepare for our trip there, May 2-10.
Atget images from around the web: