<p><b>Millions live there, millions more visit each year ¿ but how many really know London?</b></p><p>Find out:</p><ul><li>How New York¿s famous Central Park came to be modelled on a seventeenth-century London square</li><li>When Primrose Hill almost gained a pyramid even larger than the Great Pyramid of Cheops</li><li>Why about 640 people came to be drowned in the Thames in a single night</li><li>What the royal family might do to escape London if the balloon ever goes up</li></ul>