Which day of each week there is free entry to the:
National Museum, Warsaw, Poland
Museum of Warsaw and
POLIN Museum in Warsaw ?
I'd suggest that you look at the websites as dates vary from time to time. The Uprising museum is free on Sundays but I would advise you go on another day and pay - you will enjoy it much more: the museum is really crowded on a Sunday. Museums in Poland are very or reasonably cheap for a Western visitor.
The National Museum is currently free on Tuesdays.
Sunday
Sunday.
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