Many people visit Capital Cities when travelling, but what about 2nd cities? Here are the second-biggest cities in every country of the world - or the largest, in cases where the capital is not the biggest city. City-states (Vatican, Singapore etc) without a '2nd city' have been omitted.
Note: Sweden (Gothenburg) and Switzerland (Zurich) omitted in error. Please add these - mentally at least - to your tally if you've been there, and apologies for the oversight.