I use Museum and make it into a natural history, science or space museum.
For Space Museums you can display space collectibles (dead/live aliens, space rocks, geodes, UFO/Sixam plants, space prints from the observatory) and add observatories, rockets, GTW satellite dish and portal. You can also add alien/astronaut suits on mannequins and the astronaut sculpture.
Add in SimEarth ones for Natural History (metals/crystals/fish/frogs/insects/fossils/feathers/microscope prints/diving prints/seashells) along with microscopes, weather machine, beehive, bug farm, plants (botanical garden/greenhouse/dome area) and anthropological displays of humans sims throughout history (pre-historic sim/medieval/Victorian etc mannequins and scenes). You could also include JA archeology table and artifacts here, but they also fit in a regular museum with art and sculptures (as do mannequins with period clothing, or famous sim clothing)
Science Museum would combine both of the above as well as technological displays such as robotics workbench and robots/cybernetics, GTW cloning device, constructor and chemistry set, EL inventions and fabricator, vacuums etc.