Yesterday in Paris, the world’s most popular museum, the Louvre, had to shut down due to a work stoppage by employees. The museum’s staff said they were protesting work conditions at the museum. The main complaint: They’re overwhelmed by the number of visitors. The closure followed a weekend of protests across Portugal, Spain and Italy against “overtourism.” The World’s Host Marco Werman heard from Elaine Sciolino, author of “Adventures in the Louvre: How to Fall in Love with the World’s Greatest Museum.”