This is the 2074th most frequent Polish word.
muzeów
"Muzeów" means "museums" (genitive plural) in English.
The word 'muzeów' is the genitive plural form of 'muzeum', used here to indicate 'of museums' after the word 'wiele' (many).
W Warszawie znajduje się wiele muzeów.
There are many museums in Warsaw.
Here, 'muzeów' is in the genitive plural, as the word 'zwiedzanie' (visiting) requires it to indicate the action of exploring multiple museums.
Zwiedzanie muzeów jest pouczające.
Visiting museums is educational.
In this case, 'muzeów' is the genitive plural form of 'muzeum', used after the numerical quantity 'wielu' (many) to adhere to grammatical rules.