On this day in 1929

In 1929, the Empire State Building was a long way from completion when an announcement was made on this day. The building's sponsors unveiled their plans to top the skyscraper with a mooring tower, because it seemed likely that there would be regular worldwide zeppelin service in the near future. One zeppelin did actually tie up briefly, but the tower's major effect was that it gave the building a good deal more height - and another observation deck.

The point of this is that the next time you are opining on the certainty of what lies in the future just take a look at that pointy needle on top of the Empire State Building, and ask yourself where all the zeppelins went.