Gare de Denfert-Rochereau is a railway station in Paris. It was one of the first stations of the French railway network, and is still in use as a station of Paris' RER line B.
The station was built from 1842 and opened on 7 June 1846 as the Gare d'Enfer, after the nearby Place d'Enfer, itself named after the Barrière d'Enfer. The station building had a circular shape as it possessed a rail loop. Indeed, the station was the Parisian terminus of a line from Sceaux.
Wikipedia https://en.wikipedia.org/wiki/Denfert-Rochereau_station
Address 1 Avenue René Coty, Paris 75014, France
Coordinates 48°49'59.238" N 2°20'0.945" E