In the Netherlands there's this eternal rivalry between Amsterdam and Rotterdam. They're the two largest cities in the country, but completely different. It's North Holland versus South Holland, Ajax versus Feyenoord, canal houses versus modern architecture. It might only take one hour to travel between the two cities, but even the people, their character, and their accents are different. I've always been more drawn to Amsterdam - I studied there - and can't say I know Rotterdam very well. I knew the museums and the Koopgoot ('shopping trench') for shopping, spent New Year's Eve here in 2013, and that was about it. But all of a sudden,...