1 rue de la légion d'Honneur
METRO: basilique de Saint-Denis, LINE 13
Although not in Paris proper, because of it's historic importance and incredible sculpture I have included this burial site.
For centuries Saint-Denis was the traditional burial ground for French monarchs. During the Revolution of 1789, however, the tombs were ransacked, the bodies destroyed and many of the tombs defaced. Ironically, the bodies of those two monarchs who themselves perished at the hands of the revolutionaries, Louis XIV and Marie-Antoinette, are intact. They were originally buried in a communal grave near the Madeleine Church, when the remains were exhumed they were transferred to Saint-Denis and voilà!