It should come as a surprise to no one that the most expensive castle in the country is actually Buckingham Palace.
It is not considered to be in the same category as the castles listed because of its status as a fully functional royal residence.
The costs of this castle have skyrocketed through the years and are pegged at a whopping $7 billion, believe it or not.
After all, decorating a royal residence of this size and magnitude is never going to be a very cheap pursuit.