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A bit of a meta-museum, because it did not quite keep in with the times and became a fossizilied monument to old-style museums where you are not expected to experience or touch anything and just read the descriptions on the boards. That said, their collections of artifacts of all kinds of technologies are impressive, ranging from planes and cars to fully-functional scale models of steel mills and coal mines. Plus the purpose-built wing of the socialist Palace of Culture and Science is a splendid locale.
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Pałac Kultury i Nauki
Warsaw's most recognizable landmark has a controversial history: it was constructed in the 1950s ostensibly as a "gift" from the Soviet dictator Joseph Stalin. The gargantuan building is home to various institutions, including three theatres, a multiplex cinema, the Museum of Technology and the Congress Hall (built for Communist Party congresses, but mostly used for entertainment purposes now). An observation deck in the top floor provides (windy) views in all directions, accessible via express elevators.
Your usual multiplex in a shopping centre, but the central location makes it very convenient to visit. There is an exquisitely appointed bar for pre- or post-show drinks. It can get obnoxiously crowded in the evenings or on the weekends.
Established 1905, it is an IMAX one hundred years ago; a collection of unique 3D stereoscopic images from the 19th and 20th centuries.