Karlovac, Croatia 1774
A whole town inside a fortress, which was built
in the shape of a six-pointed star
against the advancing Turks.
Karlovac is named after Austro-Hungarian tsar Carl
Picture was uploaded to Wikimedia by Neoneo13 (Thanks Neoneo13!)
About 1680 Nové Zámky in Slovakia was built according to a similar plan
Picture uploaded to Wikipedia by Poganyp (thanks Poganyp!)