The Royal Palaces of Britain is a book that is sure to enchant any royalist as it covers not a couple palaces, but 31 of them including Buckingham Place, Windsor Castle and Hampton Court Palace. I'm sure you've heard of all three of those palaces, but have you heard of Lever Castle or Scone Palace?
This book was written by Jane Struthers and features photographs by Chris Coe and Paul Riddle, now to be honest as far as the information on the palace's go the book doesn't go in depth enough for me, but the photos - well they make the book. This is a great book to give an overview of Britain's Royal Palaces (and the link above will give you a full list of the palaces included) and is ideal if you're thinking of planning a trip to the UK.
I have found that The Royal Palaces of Britain gives you enough information to decide what palaces you want to find out more on, like a starting point really.
A regal gift that I believe will stand the test of time.