Mark Twain was a lifelong traveler, and his footsteps are all over New York City. Many of them are detailed in "Mark Twain: A Life" by Ron Powers (Free Press, 2005). Twain returned many times, renting, lecturing, being lionized and trying to raise money. Other Twain sites are better known, but on this, the centennial of his death, his ghost haunts a Twain enthusiast in New York.Read More... More on Authors