Visit to a Church or Oratory on All Souls DayUpon your visit, recite one Our Father and the Creed. The usual conditions apply. Other sources says this indulgence is granted from noon on All Saints Day through the end of All Souls, and that more than one can be gained on each day.
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.
Visit to a CemeteryA partial indulgence is granted for this prayer, and is applicable only to the souls in purgatory.
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.
“Eternal rest grant to them, O Lord, and let perpetual light shine upon them. May they rest in peace.”
The entire Enchiridion can be viewed here in Latin, and here in English. The relevant section of the Code of Canon Law is here; see also paragraph 1471 in the Catechism of the Catholic Church.