The fall of the Berlin Wall (German: Mauerfall) began the evening of 9 November 1989 and continued over the following days and weeks, with people nicknamed Mauerspechte (wall woodpeckers) using various tools to chip off souvenirs, demolishing lengthy parts in the process, and creating several unofficial border crossings. https://en.wikipedia.org/wiki/Berlin_Wall
We were in Berlin then. I was working at Field Station Berlin, and my wife was the Installation Volunteer Coordinator for ACS. Went down to the Wall that night to see all the Ossies pouring through the new crossing points - very emotional, very memorable.