When the 18th-century British writer and poet Dr. Samuel Johnson quipped in 1777, "When a man is tired of London, he is tired of life," he had not seen bustling old Edo on the other side of the planet; not long thereafter, around 1800, the city that would become modern Tokyo boasted what many historians say was the world's largest urban population. Above all, what Johnson knew from London -- from the commerce of its River Thames port to the artist William Hogarth's booze-soaked "Gin Lane" -- was that the character, allure and lifeblood of a great metropolis may be measured by the vitality of its streets.






