(CNN) — A woman with a mysterious smile is one of the most magnetic draws at the world's most popular museum.

Not familiar with her? Here's another hint: This centuries-old museum took a breathtaking modern leap in 1989 with the introduction of a glass pyramid outside.

CNN's Nick Glass looks at the tradition of copying great works of art at the Louvre Museum in Paris.

CNN's Nick Glass looks at the maintenance and upkeep necessary at the world famous Louvre Museum in Paris.

CNN gets rare access to film inside the Louvre, including one of the first interviews with new director Jean Luc Martinez.

CNN's Nick Glass looks at the tradition of copying great works of art at the Louvre Museum in Paris.

CNN's Nick Glass looks at the maintenance and upkeep necessary at the world famous Louvre Museum in Paris.

Not surprisingly, the Louvre in Paris is the world's most visited museum, with 9.3 million visitors last year, according to the 2013 Museum Index.

The index, released this month as part of the TEA/AECOM Global Attractions Attendance Report, is in its second year of tracking museum attendance.

The report tracks top museums in Europe, the United States, Canada and the Asia-Pacific region. Next year, Mexico and Latin America will be included in the museum category, according to engineering design firm AECOM, one of the organizations behind the index.

The top 20 museums for 2013 include six museums in London, thanks in part to the heavily promoted 2012 Olympic Games, which brought a boost in visitor interest in the city. Four museums in Washington, three in Paris, two in New York, two in China, two in Taiwan and one in Vatican City round out the rest of the list.