Italy
Charenza, also Karentia or Karenz, later also Gharense, was a medieval Slavic burgwall on the island of Rügen in the Baltic Sea. It was the administrative centre of the Rani tribe and of the Principality of Rugia. Today, the remnants are called Venz Castle (German: Venzer Burgwall).
Listen to the audio guide for Charenza Free on WIP — starts by itself when you arrive, even with the screen off