It's all by accident rather than design. I lived in/near London for around 10 years. I went to a conference in DC last autumn. I had a day trip to NY in January with a friend who wanted to see everything. So the only place I've actually gone to visit is Paris. And two of the three times I was there were on school trips (as teacher, not student) so I wasn't really in charge of what we saw then. I have no plans to start travelling the world as a tourist.