This is the 17165th most frequent Polish word.
zabytku
"Zabytku" means "monument" or "historic site" in English.
In this sentence, 'zabytków' is the plural form of 'zabytek' (monument) in the genitive case, used to denote possession or relation.
Spacerowałem wczoraj po parku i podziwiałem architekturę zabytków.
Yesterday, I walked through the park and admired the architecture of monuments.
Here, 'zabytków' again represents the plural form, referring to cultural or historical relics found in the museum.
W muzeum można zobaczyć wiele zabytków kultury średniowiecznej.
In the museum, you can see many relics of medieval culture.
In this instance, 'zabytków' is utilized descriptively to highlight the subject of rules during the tour, being ancient items.