The former President of the Soviet Union's reforms in 1987, known as Perestroika, and the release of the dissident poet Irina Ratushinskaya in 1986.
Plus a survivor of the Marikana Massacre in South Africa, the Native American nicknamed 'the Last Indian' and Princess Diana's dance with John Travolta at the White House.
(Photo: Mikhail Gorbachev (centre right) meets with the Warsaw Pact Foreign Ministers' Committee in Moscow in 1987. Credit: AFP / Getty Images)