Could I suggest that what you are looking for is Gradlitz, nowadays Choustnikovo Hradiste, approx. 100km ENE of Prague? Also with the family name, my linguistic skills do not embrace Czech but I have a friend in Iowa who is married to a Hruska of Czech descent. Is it possible that this is a simplified, Americanised, version of the name you are trying to trace? Hope my suggestions are useful.