1859 – Charles Blondin the French acrobat crossed Niagara Falls on a tightrope on the 30th June 1859.
1860 – The 1860 Oxford evolution debate at the Oxford University Museum of Natural History took place on the 30th June 1860.
1864 – U.S. President Abraham Lincoln granted Yosemite Valley to California for public use, resort and recreation on the 30th June 1864.
1882 – Charles J. Guiteau was hung in Washington, D.C. on the 30th June 1882, for the assassination of U.S. President James Garfield.
1886 – The 1st transcontinental train trip across Canada departed from Montreal on the 30th June 1886, and arrived in Port Moody, British Columbia on July 4 1886.
1905 – Albert Einstein published the article On the Electrodynamics of Moving Bodies, on the 30th June 1905, in which he introduced special relativity.
1908 – The Tunguska event occurred in remote Siberia on the 30th June 1908.
1912 – The Regina Cyclone hit Regina, Saskatchewan on the 30th June 1912, killing 28. The Regina Cyclone remains Canada’s deadliest tornado event.
1937 – The world’s 1st emergency telephone number, 999, was introduced in London on the 30th June 1937.
1953 – The 1st Chevrolet Corvette rolled off the assembly line on the 30th June 1953, in Flint, Michigan.
1956 – A TWA Super Constellation and a United Airlines DC-7 collided above the Grand Canyon in Arizona on the 30th June 1956, killing all 128 on board both planes. It was the worst-ever aviation disaster at that point in time.
1959 – A United States Air Force F-100 Super Sabre from Kadena Air Base, Okinawa, crashed into a nearby elementary school on the 30th June 1959, killing 11 students plus 6 residents in the local neighborhood.
1960 – Congo gained independence from Belgium on the 30th June 1960.
1963 – Ciaculli massacre: a car bomb, intended for Mafia boss Salvatore Greco killed 7 police officers and military personnel near Palermo on the 30th June 1963.
1966 – The National Organization for Women known as the United States’ largest feminist organization was founded on the 30th June 1966.
1971 – The crew of the Soviet Soyuz 11 spacecraft were killed on the 30th June 1971, when their air supply escaped through a faulty valve.
1972 – The 1st leap second was added to the UTC time system on the 30th June 1972.
1985 – Thirty-nine American hostages from the hijacked TWA Flight 847 were freed in Beirut on the 30th June 1985, after being held for 17 days.
1987 – The Royal Canadian Mint introduced the $1 coin, known as the Loonie on the 30th June 1987.
1990 – East Germany and West Germany merged their economies on the 30th June 1990.
1997 – The United Kingdom transferred sovereignty over Hong Kong to the People’s Republic of China on the 30th June 1997.
2006 ~ Mortified the Australian children’s television series was first broadcast on the 30th June 2006 (to the 11th April 2007).
2013 – 19 firefighters died while controlling a wildfire in Yarnell, Arizona on the 30th June 2013.
Today in History for June 30th ~ video presented by the Associated Press…