This site posted by Doug Curry is pretty good.  It's original WWII photos of soldiers on streets then they place the soldiers on a modern photo of today.  KEEP IN MIND THESE ARE NOT REAL GHOSTS.  IT'S A PROJECT.  ITS BEAUTIFUL ART NOT PARANORMAL.

http://www.guns.com/2013/02/27/ghosts-of-history-found-wwii-photographs-superimposed-on-modern-in-current-street-scenes/