The Poros Archaeological Museum is located on Koryzi Square. It was founded by Christos Fourniadis, an archaeology buff who made it his mission to rescue and preserve Trizinias’s antiquities.

The museum exhibits are displayed in two halls, one at ground level and one on the upper floor, with sculptures, epigraphs, architectural elements and other finds from Trizinia, Kalavria, Methana, and the Ermioni area. The most important exhibits in the Poros archaeological collection are a large marble relief of a dog recovered from an ancient structure; a plaster mold of the Troezen stele with Themistocles’s 480 B.C. decree on the Persian invasion; a c. 600 B.C. grave marker from Methana; a 369 B.C. tributary decree by Troezen; and the signed pedestal of a bronze bust of the Roman Emperor Marcus Aurelias which was a votive from Methana (175-180 B.C.).

Exhibits span the Mycenaean Period to the Early Christian era.