Elaine Sciolino writes: “King Dagobert’s bronze throne. Charlemagne’s ivory chess pieces. Mozart’s handwritten score of “Don Giovanni.” A 16th-century globe—the first to use the word “America.” In a library? Yes, but not just any library. These works belong to the National Library of France. After 12 years and 261 million euros (more than $256 million) of renovations, the country’s national library in the heart of Paris has reopened and is showing off more than 900 of its treasures.”