Exactly 20 years ago Hungarian border guards began dismantling the physical barrier along the Hungarian-Austrian border known as the Iron Curtain.
It was an act with huge consequences for other Eastern European countries and eventually the whole of Europe.
Only a tiny section of the Iron Curtain was removed on 2 May 1989 - about 8 km in total, either side of four border crossings between Hungary and Austria.
But it was an act of massive moral and political importance.
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