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Electrical engineering milestone. Transatlantic Radio Signals. At Signal Hill on 12 December 1901 Guglielmo Marconi and his assistant George Kemp confirmed the reception of the first transatlantic radio signals with a telephone receiver and a wire antenna kept aloft by a kite. They heard morse code for the letter "S" transmitted from Poldhc Cornwall. Their experiments showed that radio signals extended far beyond the horizon giving radio a new global dimension for communication in the twentieth century

Signal Hill, St John's, NL, Canada

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IEEE Milestone in Electrical Engineering and Computing Code-breaking at Bletchley Park during World War II, 1939-45. On this site during the 1939-45 World War, 12,000 men and women broke the German Lorenz and Enigma ciphers, as well as Japanese and Italian codes and ciphers. They used innovative mathematical analysis and were assisted by two computing machines developed here by teams led by Alan Turing: the electro-mathematical Bombe developed with Gordon Welchman, and the electronic Colossus designed by Tommy Flowers. These achievements greatly shortened the war, thereby saving countless lives.

Bletchley Park House, Bletchley Park, Bletchley, United Kingdom