June 30 in history

On June 30:

1859 French acrobat Charles Blondin crossed Niagra Falls on a tightrope.

  Blondin carrying his manager, Harry Colcord, on a tightrope

1934  Adolf Hitler’s violent purge, the Night of the Long Knives, took place.

1939 The first edition of the New Zealand Listener was published.

1980 Vigdís Finnbogadóttir was elected the first woman president of Iceland.