[...] from January 2020 all museums run by the state of Berlin will not charge for admission on one Sunday a month. The entry-free Sunday, also known as the “Family Sunday” (Familiensonntag), will apply to the German Museum of Technology, the Georg Kolbe-, Bröhan- and Brücke Museums, and the Stadtmuseum Berlin Museums (including Märkisches Museum, Nikolaikirche, Ephraim-Palais and Knoblauchhaus).

It is then almost certain that, from 2020, some of the capital’s federal museums will also start to offer entry-free Sundays. This would include some of Berlin's biggest attractions, including the museums on Museuminsel, the Neue Nationalgalerie and the Hamburger Bahnhof [...]

[src: https://www.iamexpat.de/lifestyle/lifestyle-news/berlin-museums-introduce-admission-free-sundays]