I have a lot of castle photos saved from places I've never been, but which make me dream...but since there has been some discussion of what they were like to visit:
This is Warwick Castle (Warwickshire, England.) I visited it in 1994 or so, purely by accident: I spotted it from the motorway and my family decided to trust to serendipity. At the time, while it was being operated as an attraction (and still is), a wing was still inhabited by the Earls of Warwick, and off-limits. I don't know if they're still there!
The modern-day Earls may not be Nevilles, but the Nevilles are the most famous Earls of Warwick. King Edward IV's mother, Cecily Neville, was from the extended family, and Edward's brothers married the Earl's daughters -- George, Duke of Clarence (the first man to be imprisoned in the Tower of London, notoriously said to have been drowned there in his favorite wine) married Isabel Neville, while Richard, Duke of Gloucester (Richard III) married Anne Neville (he was her second husband, and he had to sign a sort of prenup essentially waiving any rights to her inheritance, to get his family to agree to it -- George was NOT eager to share his heiress's windfall!) The Earls of Warwick were so politically powerful that Isabel and Anne's father, the 16th Earl, was known as the Kingmaker for his importance in the Wars of the Roses.
The castle is gorgeous, and the views of the countryside are exquisite. It may be more well known now, but when we went in 1994, there were NO tour groups and very few other people there. Just us and centuries of history, beautifully preserved.