More interesting than this? Per Wikipedia:
In 1913, Adolf Hitler, Leon Trotsky, Joseph Tito, Sigmund Freud and Joseph Stalin all lived within a few miles of each other in central Vienna, some of them being regulars at the same coffeehouses.
It appears that Wikipedia grabbed this from the BBC. Which urban conglomeration attracted these polemic and opinionated citizens? Vienna. I was looking for information about man-made canals and dams, and ended up in Vienna (The Wikipedia page, not the city).