17 July 1918 and 9 November 1989. The Murder of the Russian royal family marked Russia's irrevocable move from a monarchy to a Communist state. Seventy Years later, the fall of the Berlin Wall symbolised the collapse of the ideology.

2 December 1942 and 26 April 1986. The first controlled nuclear chain reaction heralded the atomic age, but Chernobyl's runaway chain reaction was the first warning. How did the most exciting scientific breakthroughs ever lead to the disaster that the world had dreaded?

22 November 1963 and 8 August 1974. No one could have dreamed or anticipated the seismic shocks America suffered in the 20th century with the assassination of its youngest-ever leader and the disgrace and expulsion of its most successful election winner.

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6 May 1937 And 27 January 1986. Two traumatic air disasters highlighting the human cost of aviation: the transatlantic crossing of the luxurious airship Hindenburg ends in disaster while tragic events accompany the launch of the Challenger space shuttle.

In September 1970 Terrorists hijacked a number of jetliners, flew them to Jordan and kept numerous hostages to enforce their demands. In December 1988 Pan Am flight 103 was blown from the sky killing all aboard and a number of Lockerbie Scotland residents.