I liked this, which is a large outdoor display on the history of Solidarity (Solidarność) throughout Poland. The posters are in Polish and English, which is handy, and they cover a wide variety of regions of the country and with plenty of photos on them.
The installation was unveiled at Piłsudski Square, an important location in Warsaw, on 28 August 2020. On that day, numerous awards, known as Crosses of Freedom and Solidarity, were granted to some of those who had opposed communism between 1956 and 1989.
If I understand the Government press release correctly, there are also similar activities across Poland to mark the 40th anniversary of the founding of Solidarity. Andrzej Duda, the country’s President, has been supportive of this installation as part of the “Centenary of Regaining Independence” series of events.