Yeah, them.I tried Wiki and it didn't really define which pictures were which. It also said that there aren't records of some of them.
What about googling that artists name? I don't remember who the artist was.
Unfortunately "Il Vecchio Castello" is one of those. The painting is described in von Riesemann's biography of Mussorgsky as "an old tower of the Middle Ages, before which a minstrel sings his song..."This is the most concise "Pictures" site I've found.........