David McCullough is going to need a larger trophy case. Adding to his Presidential Medal of Freedom, two Pulitzer Prizes, and two National Book Awards, the celebrated historian was inducted Monday into the French Légion d'Honneur by Boston's Consul General of France. Becoming a member of the Legion of Honor is considered one of the country's highest awards, requiring an official decree by the president of the French Republic. (That'd be François Hollande.) It's also France's oldest order, dating back to the era of Napoleon. McCullough's most recent book, "The Greater Journey," tells the story of American intellectuals who traveled to France in the 19th and 20th centuries to find inspiration and promote innovation in medicine, politics, and architecture. "The connections between France and the United States has been a theme of many of my books," he told us. "I've learned a great deal because of it and to have that recognized by the Republic of France itself is almost beyond anything I could have imagined. The fact is that France is interwoven with our nation before the beginning and you can't leave it out if you really want to tell the story."