Klis Fortress
The name Klis comes from the Greek word “Kleis” which means “key”, and indeed, this stone structure has been known as the Key to Dalmatia for a long time. Klis was first mentioned in the history books way back in the 2nd century BC when it was a fortress for an Illyrian tribe. Since then, it has withstood many invasions and changed hands a few times, each new owner adding their own touches.