When you put the question to people who are on the street: in your opinion, when were the chateaux built? I am sure they will answer from medieval times until the 18th century. If you ask the same question about churches, you will have about the same question. But that’s wrong, because we have continued to build castles and churches until now. It’s true that sometimes the result is surprising and sometimes, let’s say it, really ugly.
We must not generalize.
We present here several castles which are really modern and which still keeps some aesthetics.
First, a real beautiful castle with beautiful stone walls. Even if its general appearance is too new, after a few decades, it will be beautiful:
Then a castle with feet in the water:
Finally, the alliance of the modern and the old:
If you want to make a plan of a castle or a plan of a church or a cathedral (besides, one could launch a contest to make a plan of the Notre Dame cathedral in Paris), you can use the archiplain plan editor which you will vary several parameters for your greater satisfaction.