Will a prenup protect property in another country?

My fiancé and I are both from Poland and I own a significant amount of property there, some of it in my own name and some of it with my family. My family is very concerned that if my marriage does not work out, my wife will be entitled to a portion of both my property and the family properties. They want me to obtain a prenuptial agreement to ensure the properties are protected in the event of divorce. Will a prenup executed in the U.S. protect my properties in Poland? Would the agreement need to be enforceable in Poland? I also need to find a Polish lawyer who can help me with these issues.