Paris: because some French collaborated during the Second World War
Frankfurt: because some Germans started the Second World War
Athens: because most Greeks now live in Melbourne
Rome: because they wanted to prove that not all roads lead there....
Amsterdam: because they had too many staff delayed by certain attractions there
Belgrade: because Qantas simply forgot it existed
Istanbul: because new generations of Aussies never learned it existed
Manchester: I can't say, as I am not a soccer fanatic.
@lucas2019 , my answers are silly, but maybe if you made it clear what you are trying to learn or achieve, people could really help you more?