A Graveyard Structure

A possible graveyard that could have lots of undead mobs that could differ between boomers (strays instead of skeletons in cold biomes for example) and could have fences or iron bars around it with gravestones with a possible stone sign variant. And a mausoleum in the center that goes underground and has a mob spawner that spawns armored undead mobs and has treasure in it that I'll leave it to you to determine. Also could have a deep dark variant with the mobs of the dark I suggested in another thread