Fantasy depictions of huge castles usually show gargantuan white walls reaching the skies. Let's have a walk through a real, monstrous castle that never fell to a siege and see what was practical in castle construction
Disclaimer: depending on your definition of a castle this may not be the largest castle on Earth or not a castle at all.
Usually a castle is defined as a fortified feudal residence. The Malbork Castle was the residence of the Grand Master of the Teutonic Order and later (when it was sold to Poland) became one of the residences of the Polish kings.
Lets start from here:
Many castles would fit among these walls. But this is just a yard before the outermost gate.
When you pass the gate here you are still a long walk from the real entrance:
The tower in the distance is the actual heart of the castle. It's a long walk even if nobody bothers you.
Note that the large windows are most likely XIX century additions when the castle was used as a storage house by the Prussians.
And then when you get inside you reach the castle-within-castle:
Which is protected by a serious gatehouse with all the traps money could buy:
And then there is still another castle-within-castle:
And within this innermost castle there is still the tower to be handled:
So the bottom line is that it was much more practical to create a labyrinth of walls and gates (that can be opened wide for a legal visitor) rather than a very high structure that would require an hour of mountaineering just to get to the bathroom…
This part of the website is called „Inspirations” for a reason. The castle is too large (doh! that was the idea) to show in full here.