Jeff Steiner, an American living in France, has a monthly newsletter in which, from time to time, he has a photo feature called Yesterday & Today in which old photos are merged with new ones of the same place and vantage point to create what to me feels a bit like time travel. I don't find one link to them so I'll give you the individual links. I especially like the first one with a group coming up a hill. They seem to be emerging from the past and looking directly at us in the present:
http://www.americansinfrance.n...Villars-Postcard.cfm
http://www.americansinfrance.n...07-Looking-Glass.cfm
http://www.americansinfrance.n...d-August-27-1914.cfm
http://www.americansinfrance.n...card-May-25-1911.cfm
http://www.americansinfrance.n...er-December-2013.cfm