I made a few corrections to this video. If you already posted a comment under the previous version: don't worry, I have read it and taken it into account

Sources:
- Halle 12 in 1954 - By Bundesarchiv, Bild 183-1985-0903-101 / Wolfried Pätzold / CC-BY-SA 3.0, CC BY-SA 3.0 de, https://commons.wikimedia.org/w/index...
- Halle 15 in 1952 - By Deutsche Fotothek‎, CC BY-SA 3.0 de, https://commons.wikimedia.org/w/index...
- Montagsdemonstration 1989 – By Bundesarchiv, Bild 183-1990-0922-002 / Friedrich Gahlbeck / CC-BY-SA 3.0, CC BY-SA 3.0 de, https://commons.wikimedia.org/w/index...