From the introduction:
St. Tobit‘s is a sprawling cemetery, rows of severe tombstones and picturesque crypts, interspersed with untamed hedges and statues of beheaded angels. It‘s a solemn place, but in its darker corners terrors and treasures slumber. In moonless nights, desperate grave-robbers may done masks and climb the wall with a hangman‘s rope. Even more reckless fools might let themselves be hired to dare the most dangerous sepulchers and retrieve what has been buried by wiser men.
And of course you might find burial places like this on your travels instead, even in the depths of a dungeon.