Monument I is built in the Graveyard for 5 Piece of stone. +2 graveyard quality. Unlocked by Graveyard Keeper II. Its construction site needs Building mastery 2: below that, hits do nothing.
It adds 2 to graveyard quality when it stands inside a graveyard area. Each new best graveyard quality also counts towards the Resting Place inspiration. Graveyard Keeper II also unlocks Grave Area II.
Monuments go on the monument plots of the Graveyard's areas: 2 in each Columbarium Area II and Mixed Area III, 1 in each Grave Area II, Grave Area III, Grave Area IV and Walkway Area I. Each area kind can be built twice, so the Graveyard holds at most 16 monuments.