Africa (60 countries, 181 cities)
Asia (55 countries, 333 cities)
Central America (8 countries, 42 cities)
Europe (61 countries, 886 cities)
Northern America (5 countries, 133 cities)
Pacific Islands and Australia (27 out of 28 countries, 77 cities)
South America (14 countries, 114 cities)
The Caribbean (30 countries, 58 cities)
What doesn’t count: cities where I had a layover but didn’t leave the confines of the station/airport.