During the walk over the ramparts of the fortress city of Naarden, I climbed to the highest point to have a nice overview.
The fortress has six bastions and double ramparts and canals.
Here you can see a part of the city surrounded by the fortress. Naarden was established in 1350.
Naarden is one of the best preserved fortress cities of Europe and has a unique star shape which you can see at this airview photo from internet.