Sir Robert Baden-Powell established the Boys Scouts in England.
Source
Prince Charles and Lady Diana Spencer got married at St. Paul's Cathedral in London.
Arc de Triomphe in Paris became the world's largest triumphal arch at 164 ft tall.
David Berkowitz, otherwise known as the Son of Sam serial killer, shot his first victims.
Renegades of the Abbasid Caliphate captured Thessalonica, which is modern-day Thessaloniki, Greece.
Lance Armstrong won the Tour de France for the third time in a row.