In just a few weeks, the world will descend on London for the Olympic Games.
But the world goes to London every day, according to Boris Johnson, the former journalist who has just been re-elected mayor of London. In his new book, Johnson says people don't just visit the city, they've made their lives there for centuries now. It's a city, Johnson writes, where national soccer teams from all over the world can show up and count on crowds of thousands of fans to support them.