Short answers, pulled from the story.
Winston Churchill delivered his Sinews of Peace address at Westminster College in Fulton, Missouri on the 5th of March 1946. He stated publicly that an iron curtain has descended across the Continent behind which lie all the capitals of Central and Eastern Europe.
The political boundary dividing Europe from the end of World War II in 1945 until the Cold War ended in 1990 or 1991 is known as the Iron Curtain. East of this line lay many small states controlled by the Soviet Union including Estonia, Latvia, and Lithuania annexed in 1940.
The Hungarian government announced destruction of the Iron Curtain in Rajka on the 2nd of May 1989. Foreign ministers Alois Mock and Gyula Horn ceremonially cut through the border defenses separating Austria and Hungary after reconstructing 200m of the curtain for public relations.
The Berlin Wall was constructed in 1961 to stop workers from entering West Berlin and led to the deaths of 140 people attempting to cross into the west. The barrier remained a short distance inside East German territory while official dismantling began in June 1990 when all border-controls ceased.
Decreased human activity around the physical border during the Cold War formed natural biotopes that now constitute the European Green Belt nature reserves. A long-distance cycling route called the Iron Curtain Trail spans from Finland to Greece as a project of the European Union and other associated nations.