This is the 853rd most frequent Czech word.
pražských
"Pražských" means "of Prague" or "Prague's" (possessive form).
In this sentence, 'pražských' is the genitive plural form of 'pražský', an adjective related to Prague, used here to describe the landmarks belonging to or located in Prague.
Obdivoval jsem krásu pražských památek.
I admired the beauty of Prague's landmarks.
Here, 'pražských' is also used in the genitive plural, relating to 'koláče' (pastries), signifying pastries associated with Prague.
Chuť pražských koláčů je nezapomenutelná.
The taste of Prague's pastries is unforgettable.
In this case, 'pražských' again serves as an adjective in the genitive plural, modifying 'kapely' (bands), to indicate their origin or strong connection to Prague.