the default hospital

There's probably a copy of it uploaded to the gallery. I know there are plenty of variations on it because I went looking for a nicer hospital to replace the default. But, yes, you can do as LaBlue has said and copy it into your library from your game.

It's not much use though, as it will not function as a proper hospital if you place it in one of your worlds (I did it once for storytelling but soon got fed up with the wasted space and deleted it).