West of the village Trypiti, in a small valley, lay the ruins of the catholic Isova Monastery, one of the country’s most significant gothic monuments. It was built by Cistercian monks who arrived in the Peloponnese during the Frankish rule. There is a second Cistercian order monastery in the Peloponnese, the monastery of Zarakas in Stymfalia Lake. The impressive gothic monastery was built in 1225 to be ruined 40 years later when it was burned by the byzantine troops.
The remains of the edifice lie behind the church of Saint Nicolas. Only the north wall and the west apse have been preserved from this large construction (its total length exceeds 40 m). It was an aisleless church with a saddleback roof and unique pointed barrel windows. Traces of the monks’ cells can be visited on the north side of the church.