kościołów

In a sentence

• W naszym mieście jest wiele starych kościołów.

  In our city, there are many old churches.

  Here, 'kościołów' is the plural genitive form of 'kościół' (church), used after 'wiele' (many), which requires this case.

• Kontury kościołów rysowały się na horyzoncie.

  The outlines of the churches were drawn on the horizon.

  In this sentence, 'kościołów' is also in the plural genitive case, as it follows the word 'kontury' referring to their collective delineation.

• Widziałam album ze zdjęciami najpiękniejszych kościołów w Europie.

  I saw an album featuring photos of the most beautiful churches in Europe.

  'Kościołów' is again in the plural genitive case, as it follows 'najpiękniejszych', which describes the adjective to mean (of the churches).