With this mod installed you can find a new venue type "Graveyard" in build mode. This venue is special and will change during the night time. During the day is a calm place to remember the Sims you lost and spend some time reminiscing their life.
The mod works on residential and public lots and adds special properties to them. Do you want to build a house where Sims will constantly feel like someone is watching them and see voices? Or make it so that everyone in the library is really silent, and romance is in the air in the cafe?