In 1859, the S.S. Great Eastern departed from England on her maiden voyage. She was a remarkable wonder of the nineteenth century: an iron city longer than Trafalgar Square, taller than Big Ben's tower, heavier than Westminster Cathedral. Her paddles were the size of Ferris wheels; her decks could hold four thousand passengers bound for America, or ten thousand troops bound for the Raj. Yet she ended her days as a floating carnival before...