Six Pointed Star Fortress

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!)

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About 1680 Nové Zámky in Slovakia was built according to a similar plan

Picture uploaded to Wikipedia by Poganyp (thanks Poganyp!)