There’s a really nice one in Lille, France – you have to pass through an outer ring of stellated defences (not knowing where you need to go, and probably with defenders dropping things on you from above) and then you’re faced with another inner set of stellated defences.

This is why spies drawing maps of defences were so important in those days.

Considerably more common than black squirrels, if you go by range.

@Seven Bates. You hate “grammar Nazis”, not “grammar Nazi’s”.

Only in the Netherlands.
And the most important reason all those walls and moats around cities still exist, is because at the critical time when the function of fortification was scrapped- they did’t have money to demolish them…. And only several decades later, some folks started to see their touristic value and now all those cities that demolshed theirs scream with envie and some try to bring back some traces of those walls and moats…

and
http://en.wikipedia.org/wiki/Vauban#Fortifications
A French architect who specialized on star forts.

- I know. I hate grammar Nazi’s too. Sorry.

Sometimes called “The Gibraltar of North America”. Originally to defend against the English, then against the Americans, it is currently an active Canadian military garrison.

This is the site of an important battle in North American history; in 1759, for better or for worse, British forces defeated French forces at the Plains of Abraham and decided the balance of French vs. English dominance in North America.
Here’s some light history: http://en.wikipedia.org/wiki/Battle_of_Quebec_(1759)

Of course, the long term result was that removing the French threat removed the colonists’ need to rely on the British military, one of the factors leading to the American revolutionary war.