Reminder. 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.
The Enchiridion Of Indulgences #13, p. 23http://www.freecatholicebooks.com/books/indulgences.pdf