Crypt is built in the Graveyard for 6 Polished Stone and 2 Iron Detail. +10 graveyard quality. Unlocked by Mixed Graveyard I. Its construction site needs Building mastery 4: below that, hits do nothing.
It adds 10 to graveyard quality when it stands inside a graveyard area. Each new best graveyard quality also counts towards the Resting Place inspiration. Mixed Graveyard I also unlocks Mixed Area I.
Columbaria and the Crypt go on the columbarium plots of the Graveyard's areas: 2 in each Columbarium Area I and Columbarium Area II, 1 in each Mixed Area I, Mixed Area II and Mixed Area III. Each area kind can be built twice, so the Graveyard holds at most 14 columbaria and crypts.