Answer:
French sites and monuments, by descending numbers of visitors:
1 Notre-Dame de Paris cathedral : 13.6 million;
2 Sacré-Coeur de Montmartre (basilica) 10.5 million;
3 le Louvre museum, 8.5 million (2008);
- the Eiffel Tower 6.8 million;
- Château de Versailles 5.6 million (2008)
- Centre Pompidou (the "inside-out" building): 5.5 million (library + museum)
- Orsay museum: 3.2 million;
- Cité des Sciences et de l'Industrie 3.12 million;
- le musée du Quai Branly, 1.4 million;
- Arc de Triomphe 1.3 million.