London: Let's turn round and plunge into the world where you have never been before.
The world of fascinating and delightful medieval architecture, there isn't anything quite as mysterious and spectacular as an old castle. Many castles carry with them scars from histories most influential moments.
In the Middle Ages rulers began building castles for protection. In a time of war, the castle was a stronghold for conquering nations.
Castles have been battered and left inhabitable, but it is difficult to completely destroy a well built structure.
Here are the world's top 15 amazing and mysterious castle: