Helfstyn castle in Moravia, Czech Republic. It started as a fortress of a marauding knight, and transformed to be a major military installation. It has four courtyards making any conquest arduous task.

Comments

1. DeeLiberty says

   https://en.wikipedia.org/wiki/Helf%C5%A1t%C3%BDn

2. ElCactosa says

   my friends don’t understand when i make my minecraft castles with the idea that ‘it makes any conquest an arduous task’