What Exactly is the Purpose of the Museum Lot?

I left one museum in game and added science objects to it that the general public can use. Its purpose is to house Big Things, same as @DaWaterRat has done. Otherwise, it really just comes down to story play. For example, I have a club of artist Sims whose venues are museums, so if my Sims go to museums it won't always just be randoms there when my Sims have an outing to a museum.