A finding of the Mycenaean civilization was discovered at Tzanata near the village of Poros. It is the largest known beehive-shaped or tholos tomb in the Ionian Islands and is unique of its kind.
The tomb itself is considered to be a royal grave and golden jewellery, royal seals and precious stones accompanied the tomb and can be seen in the Archaeological Museum of Argostoli.
There have been claims that this was the burial place of Odysseus himself. The tomb was built on top of another smaller grave, which had collapsed for unknown reasons.