Paris is one of the oldest cities in the world and one of the most densely populated cities in the world.
The most impressive thing about Paris is the three famous landmarks, Notre Dame Cathedral, the Arc de Triomphe built by Napoleon I, and the Eiffel Tower in the 19th century.
Besides Notre Dame, other well-known churches include the 13th-century Gothic court chapel Sainte-Chapelle and the Chapel of the Madeleine.
In 1991, many places of interest along the Seine River in Paris were included in the World Heritage List.