In 1990 the leaning tower of Pisa, Italy was closed to the public for the first time in history, due to fears of public safety.
In 1974 Crowds of spectators gathered to witness army personnel at Heathrow airport in London, England. Believed to be a training exercise against terrorism, observers viewed armed personnel with rifles and machine guns, along with armoured vehicles and tanks. Reports also circulated that this was actually in response to information that terrorists planed to shoot down an American or Israeli plane. In 2005 official documents released by the United Kingdom's government confirmed that there was a shoot to kill policy at the airport on this day after information about an Arab terrorist attack from Interpol Intelligence.
In 1953 President Harry Truman announces that the United States of America have developed a Hydrogen Bomb (H-Bomb).
In 1789 the first Presidential elections were held in the United States of America. Only white property owners were allowed to vote in the elections. George Washington won the election and was sworn into office on the 30th of April.
In 1785 American John Jefferies and Frenchman Jean-Pierre Blanchard are the first people to cross the English Channel by air. They travelled from Dover to Calais in a gas balloon.
In 1610 Galileo Galilei first used his new instrument, the telescope (which he constructed based on a child’s toy being sold in the market place in Italy) to look at the planet Jupiter.
