In a mountainous location, currently known as "Castle Kallithea" near the modern homonymous village, the ancient city of "Perioikis Achaia Fthiotis" Pevma was built. The city stood on top of the passage from Enipeas valley to Almyros plain and dominated the country with its tall peak (617 m). The base of its mountain is surrounded on three sides by the deep valley of Enipeas.

The city's life is being followed from the 4th century BC, roughly, to the 1st century BC. However, its bloom is traced from the 3rd century BC to the 1st century BC, where it has been a member of the Public (Confederation)  Achaia Phthiotis, in which Eretria's opposing city, Meliteia, was not part of. As a part of this Confederation the city minted coins bearing the name Ah.

The city was walled and fortified with towers. The wall, about 2.4 km long, is built with the engager technique has a width ranging from 2.70 to 2.85 m and its maximum preserved height is 2.10 m. It is fortified with 36 towers, built at the same time with the rest of the wall, with a width from 6.00 to 6.60 m. It was encompassed by two hills, to the west and east, having two well-fortified gates, west and east respectively, the second of which was opening towards the valley of Enipeas.

Inside the city, on the western hill, the Citadel stands. Its circular wall, covering an area of 300 m, is older and less powerful than that of the rest of the city, as its width does not exceed 2.00 m. It houses two towers, manufactured after the original wall.

The oldest part of the city was the Citadel, while it appears that its extension to the eastern hill must have been made the period between 4th to 3rd century BC, where the city acquired a new, single plan. The market and public buildings were constructed in the west, while private residences moved to the east.

The archaeological excavations are progressing in the area from 2004 until today, from a scientific team from the University of Alberta, Canada in collaboration with the XV Prehistoric Classical Antiquities Authority, unearthing part of the ancient market, arcade altar and private residences. The city was built according to the Eppodamius planning system.
At the foot of the mountain in 1964, the Greek archaeologist, D. Theocharis, excavated tholos tombs of the Iron Age (11th century BC).

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