If you're near the palace of culture and science (the big Stalinian building), just cross the street (using the underground walkways).
between 2 buildings you'll see a small sign "Photoplasticon"... just walk in the court, towards the end, you'll get in a small room where the photoplasticon machine is...
You'll see lots of old pictures that are projected in the machine and are sort of 3D.
WORTH the detour!
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