Australia v West Indies at Brisbane, 1960-1. The first tied Test.
Australia v England at Adelaide, 1932-3. Bodyline bolwling almost caused the cancellation of a tour, and a split in the ICC
India v Australia at Kolkata, 2000-1. India won the match after following on.
England v Australia at Leeds, 1981. Botham's Ashes. England won after following on.
Sri Lanka v Australia at Lahore, 1996. Sri Lanka came of age in the big league by winning the World Cup, and ODI cricket exploded in Sri Lanka
India v West Indies at Lord's, 1983. India's World Cup triumph. Cricket has never been the same in the sub-continent since.
Australia v India at Sydney, 2007-8. Another infamous match which almost saw the cancellation of a tour.
South Africa v England at Centurion, 1999-2000. The first Test in which innings were forfeit, later revealed to be part of the match-fixing ploys of Hansie Cronje.