To appreciate this florid and romantic overdose of sentimental German paintings of the 19th century, you’ve got to enjoy fauns and elves at play in picturesque, even magical, landscapes. Such art has its devotees. Obviously, if you’re a Picasso cubist, you’d be better off going elsewhere. But this once-private collection adheres to the Baroque tastes of Count Adolf Friedrich von Schack of Schwerin (1815–94), who spent a rich life acquiring works by the likes of Spitzweg, Schwind, Fuerbach, and others, many others—some of whom frankly should have been assigned to the dustbin of art history. Still, in all, we find a visit here fun, at least on a rainy, gray day. It’s like wandering back to a lost world.