Paris: 100 years ago and now

Eugene Atget is considered to have been one of the greatest photographers who ever lived. His pictures of Paris, taken before and after the turn of the 20th century, are well known. In the late 90s another photographer named Rauschenberg retraced Atget's steps and took the same photos. This site lines up the new ones and the old ones, side by side. This is one of the best photo collections I have ever seen on the web.