For example, the La Défense/Château de Vincennes line, also known as line 1 (yellow), runs between La Défense, on its west end, and Vincennes on its east end.
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Ligne 13 : this is the longest and one of the most notorious line of the Paris metro network and also the busiest. Starting at Châtillon Montrouge to the south of Paris, it goes as far as Saint Denis and Asnières Genevilliers.
Métro. The Metro is the easiest, least expensive and quickest way to go out and to get home. Fourteen lines crisscross Greater Paris, from east to west and north to south. Good to know: As part of certain celebrations and events (New Year's Eve, Fête de la Musique, etc.), the Metro is open—and free—most of the night.
However, if you have the Paris Pass on your vacation you can use the public transport network of the city (bus, RER, metro or streetcar Montmartre tram) for free within zones 1-3. The Eiffel Tower is located in Zone 1.