Parallel Time Shift.

Just finished watching an episode of Doctor Who.   Yeah, I'm a geek, I confess.  Anyway, it dealt with the same person walking in the same spot, but at different times in their life.  Then I came across this picture while looking through some old photos.

It's a picture of my Grandfather in Venice.  It's a neat shot, but the best part is this.

How far away am I?  6 steps?  20?  I had no idea how close the two of us stood, years apart, on the other side of the globe.

Neat stuff.