Sentier is a station on Paris Métro Line 3

Paris Metro Line 3

Line 3 is one of the sixteen lines of the Paris Métro rapid transit system in Paris, France. Connecting Pont de Levallois - Bécon station in the near western suburbs to Gallieni in the east, the location of Paris' international bus station...

 in the 2nd arrondissement. It opened on 20 November 1904 as part of the first section of the line between Père Lachaise

Père Lachaise (Paris Metro)

Père Lachaise is a station of the Paris Métro, serving line 2 and 3 on the border of the 11th and 20th arrondissements.The station was opened on 31 January 1903 as part of the extension of line 2 from Anvers to Bagnolet...

 and Villiers

Villiers (Paris Metro)

Villiers is a station of the Paris Métro, serving Line 2 and Line 3 on the border of the 8th and 17th arrondissement of Paris.The Line 2 platforms opened on 21 January 1903, although trains had been operating between Étoile and Anvers since 7 October 1902. On 19 October 1904, it became the terminus...

, which opened a month earlier. The station is named after a path (French: "sentier") leading to the city's fortifications, now called the Rue du Sentier. The station is one of the few to have its entrance incorporated into the front of a building. A secondary entrance is located 87 rue Réaumur, it contains railings designed by Hector Guimard

Hector Guimard

Hector Guimard was an architect, who is now the best-known representative of the French Art Nouveau style of the late nineteenth and early twentieth centuries....

and is listed as a "monument historique".