Near the village Mesopotamos and contribution of Acheron and its tributary Kokytos was the ancient city Efyra that flourished in the 5th and 6th centuries. B.C. The city became known by the necromancy of building of the 5th century. B.C. Visitors flocked from all over the known world to this unique oracle, which could after a stay initiation process and to communicate with the dead. Today its ruins distinguished corridors, rooms, central underground chamber, pots etc.