http://en.wikipedia.org/wiki/Notre_Dame_de_Paris#Timeline_of_construction
"6 June 1971: Philippe Petit surreptitiously strings a wire between the two towers of Notre Dame and tight-rope walks across it. Petit later performed a similar act between the Twin Towers of the World Trade Center."
http://en.wikipedia.org/wiki/Notre_Dame_de_Paris#Significant_events
Sometimes it might be a number like an address or the symbolic shape of a building.
http://jfdatalinks.blogspot.ca/2012/12/basilique-notre-dame-de-montreal.html
Sometimes the lines can be blurred between symbolic resonance, synchronicity & coincidence.
http://jfdatalinks.blogspot.ca/2012/09/york-england-and-new-york-usa.html
