The Prague Castle Picture Gallery is a nice exhibition museum to view if you're in the Castle District ( Hradcany ). The collection of paintings is not top notch but it's good ,some of the masters here ,its worth an hour of browsing ,staff are a bit stern if you try to photograph exhibitions but all in all its a nice attraction and its housed in a wonderful looking building, well worth checking out if you're in Prague Castle.

The Prague Castle Picture gallery has the benefit of being inside the security at Prague Castle and its close proximity to the tourist information office and St. Vitus, but there are far better museums close nearby, including the Prague National Gallery only 100 yards away with a larger and mostly better collection of old masters. The Prague Castle Picture Gallery consists of about 3 galleries. If I recall, they don’t let you take photos here. The literature and signs boast works by Rubens, Cranach, and Titian, but that’s a bit misleading as they have about one painting by each of the three and not a lot else. The Rubens is arguably the best of the three and, truthfully, it is a wonderful painting about the gods on Mt. Olympus holding some sort of court to decide a dispute between two of them (what the dispute was intended to represent is lost to history). The Cranach painting is of Saints Catherine and Barbara. I like Cranach’s work and liked this painting of two early Christian martyrs. The Titian painting is of a young woman at her toilet. The remaining paintings are mixed, but this is not a large collection. OK. So just outside castle security is the Prague National Gallery at the Sternberg Palace. The entrance to this second museum isn’t all that obvious - it was designed as a palace - and you have to walk down a curved side alley, but it is about 10 times as large and boasts wonderful works by Rembrandt (Scholar in his Study), Hals, Steen, Peter Bruegel (about 10, mostly but not all smaller works), Snyders, Rubens (I believe there were three of his works), Cranach, and others. There is also currently an outstanding exhibit on works between Saxony and Bohemia that includes many other notable paintings by Cranach and others. Or, if you want to go to the other end of Prague Castle towards the west, visit the wonderful Lobkowitz palace. It has original copies of works by Beethoven (with his editing remarks) and Mozart (in his hand), a rare and wonderful Bruegel painting, works by Canaletto and Valazquez, and many other fine works in an elegant setting. The palace itself is beautiful and it collection wonderfully curated. Plus it has great views and a nice café. This is an OK gallery, but there are two much better ones only steps away that you will enjoy a great deal more.