Although the name of the map contains the word fantasy, the castle itself is not particularly fantasy, it is simply invented by the author. It is located on a separate island and occupies it completely, it is quite large and looks very unusual due to the materials used (somewhere they are very bright and colorful).
True, there is one point that the player himself can fix – the lack of rooms. So to speak, do it yourself.
How to install the map:
Download the file and unzip it. (get the folder from the archive)
Copy the folder to .minecraft / saves
Select this save in the game.