In this May 13, 2011 photo, historian and author David McCullough poses with art by George Catlin, one of the artists featured in his new book, "The Greater Journey," at the National Portrait Gallery,... more 
In this May 13, 2011 photo, historian and author David McCullough poses with art by George Catlin, one of the artists featured in his new book, "The Greater Journey," at the National Portrait Gallery, in Washington. The book is about Americans in Paris in the 19th century. less 
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Associated Press | Photo By Jacquelyn Martin
Tue, May 24, 2011 3:21 PM EDT