If you prefer the romance of an old castle ruin, go somewhere else. This is an example of something very well preserved and much of it is of comparably modern date anyway. [18th and 19th centuries]
Having said that, there is no doubt that you will see a very historical building, going back in the present owner's family to the 17th century but for the middle ages and much of the Tudor period in the hands of the family that built it, the Nevilles. This is, of course, the family to which the Earl of Warwick, the Kingmaker, belonged and Cecily Neville was the mother of Edward the Fourth and Richard the Third. Warwick became resentful of the power of the Woodvilles [Edward's Queen's family] and joined up with the Lancastrians - only to be substantially thrashed and indeed killed in battle.
The Raby branch of the family remained powerful until they joined in planning the Rising of the North to place Mary Queen of Scots on the throne in place of Elizabeth. Raby was one of the chief centres of the conspiracy. Its failure led to the collapse of the family's power.
The castle today is in the centre of a large and lovely deer park. It retains many medieval features including the kitchen, terrific in size and appeal with a great collection of copper pans. The Baron's Hall is also particularly impressive.
In many ways its preservation makes it more like a museum with fine collections of furniture, portraits and china.
Its entry price of £5 is very reasonable for the amount to be seen.