If you want to visit the Paris Catacombs, the entrance is across the street from the Denfert Rochereau station, which is on both lines 4 and 6 of the Metro. They are really ossuaries where between five and six million skeletons from Paris’s cemeteries were moved from 1786 to 1860. These catacombs are different from those in Rome, where people were buried directly rather than being moved after they had died.
Napoleon’s tomb is in the central crypt of the Eglise du Dome Church at the Hotel des Invalides. This amazing building is situated on the Esplanade des Invalides within the 7th Arrondissement. The nearby metro station, Invalides, is on both Line 8 and 13.
Père Lachaise is on Boulevard de Ménilmontant. Metro station Philippe Auguste, on line 2, is next to the main entrance, while the station called Pere Lachaise, on lines 2 and 3, is 500 metres away near a side entrance. Gambetta station, also on line 3, is close to another entrance to the cemetery.