Claim: One major center of science is Paris.

Paris -LRB- French pronunciation : -LSB- pɑʁi -RSB- , -LSB- paʁi -RSB- -RRB- is the capital and most populous city of France . It has an area of 105 km2 and a population of 2,229,621 in 2013 within its administrative limits . The city is both a commune and department and forms the centre and headquarters of the Île-de-France , or Paris Region , which has an area of 12,012 km2 and a population in 2016 of 12,142,802 , comprising roughly 18 percent of the population of France . By the 17th century , Paris was one of Europe 's major centres of finance , commerce , fashion , science , and the arts , and it retains that position still today . The Paris Region had a GDP of $ 624 billion -LRB- US $ 687 billion -RRB- in 2012 , accounting for 30.0 percent of the GDP of France and ranking it as one of the wealthiest regions in Europe .   The City of Paris is but the core of a built-up area that extends well beyond its administrative limits . Commonly referred to as the agglomération Parisienne , and statistically as a unité urbaine -LRB- a measure of urban area -RRB- , the agglomeration has a 2013 population of 10,601,122 , which makes it the largest in the European Union . City-influenced commuter activity reaches well beyond even this in a statistical aire urbaine de Paris -LRB- a measure of metropolitan area -RRB- , that had a 2013 population of 12,405,426 , a number one-fifth the population of France , and one that makes it , after London , the second largest metropolitan area in the European Union . Although joined in a single urban tissue , Paris ' lack of administrative and economic cohesion with its suburbs has been a longstanding problem , but a 2016 ` Metropole of Grand Paris ' economic and environmental initiative covering an 814 km2 area and a population of 7 million , exists since 2016 .   The city is also a major rail , highway , and air-transport hub served by two international airports : Paris-Charles de Gaulle -LRB- the second busiest airport in Europe after London Heathrow Airport with 63.8 million passengers in 2014 -RRB- and Paris-Orly . Opened in 1900 , the city 's subway system , the Paris Métro , serves 5.23 million passengers daily . It is the second busiest metro system in Europe after Moscow Metro . Notably , Paris Gare du Nord is the busiest railway station in the world outside of Japan , with 262 millions passengers in 2015 .   Paris has many important cultural institutions : its Louvre museum is the most visited in the world ; its Musée d'Orsay is noted for its collection of French Impressionist art , and its Pompidou-center Musée National d'Art Moderne has the largest collection of modern and contemporary art in Europe . The central area of the city along the Seine River is classified as a UNESCO Heritage Site and includes many notable monuments , including Notre Dame Cathedral , the Sainte-Chapelle , the former Universal Exposition Grand Palais , Petit Palais and Eiffel Tower , and the Basilica of Sacré-Cœur in Montmartre . In 2015 , Paris received 22.2 million visitors , making it one of the world 's top tourist destinations .   The association football club Paris Saint-Germain and the rugby union club Stade Français are based in Paris . The 80,000-seat Stade de France , built for the 1998 FIFA World Cup , is located just north of Paris in the neighbouring commune of Saint-Denis . Paris hosts the annual French Open Grand Slam tennis tournament on the red clay of Roland Garros . Paris hosted the 1900 and 1924 Summer Olympics and is bidding to host the 2024 Summer Olympics . The 1938 and 1998 FIFA World Cups , the 2007 Rugby World Cup , and the 1960 , 1984 , and 2016 UEFA European Championships were also held in the city , and every July , the Tour de France bicycle race finishes in the city .