13. Visit to a Cemetery (Coemeterii visitatio)
An indulgence, applicable only to the Souls in Purgatory, is granted to the faithful, who devoutly visit a cemetery and pray, even if only mentally, for the departed.
The indulgence is plenary each day from the 1st to the 8th of November; on other days of the year it is partial.
67. Visit to a Church or Oratory on All Souls Day (Visitatio ecclesiae vel oratorii in Commemoratione omnium fidelium defunctorum)
A plenary indulgence, applicable only to the Souls in Purgatory, is granted to the faithful, who on the day dedicated to the Commemoration of all the faithful departed, piously visit a church, a public oratory or -- for those entitled to use it -- a semipublic oratory.
The above indulgence can be acquired either on the day designated above or, with the consent of the Ordinary, on the preceding or following Sunday or the feast of All Saints.
The above indulgence is contained in the Apostolic Constitution The Doctrine of Indulgences, Norm 15, with account being taken of proposals made to the Sacred Penitentiary in the meantime.
In visiting the church or oratory, it is required, according to Norm 16 of the same Apostolic Constitution, that "one Our Father and the Creed be recited." [ed. note : see Norm25 of the Enchiridion].
See a list of indulgences here.