In the south of the town of Koroni lies the castle of Koroni, which was original a simple structure. It evolved into a Byzantine fort that was consequently invaded by the Franks during the 4th crusade, around 1205. While not much of the castle remains today, there are a couple of significant churches and monuments around from different eras. Tombs, Turkish baths and Venetian reservoirs and magnificent storage domes are still preserved.