In 1989, a series of revolutions in nearby Eastern Bloc countries—in Poland and Hungary in particular—caused a chain reaction in East Germany. In particular, the Pan-European Picnic in August 1989 set in motion a peaceful development during which the Iron Curtain largely broke, the rulers in the East came under pressure, the Berlin Wall fell and finally the Eastern Bloc fell apart. After several weeks of civil unrest, the East German government announced on 9 November 1989 that all GDR citizens could visit West Germany and West Berlin. Crowds of East Germans crossed and climbed onto the Wall, joined by West Germans on the other side in a celebratory atmosphere. Over the next few weeks, euphoric people and souvenir hunters chipped away parts of the Wall. The Brandenburg Gate, a few meters from the Berlin Wall, was opened on 22 December 1989. The demolition of the Wall officially began on 13 June 1990 and was completed in 1994. The "fall of the Berlin Wall" paved the way for German reunification, which formally took place on 3 October 1990.