The ancient acropolis of Cheronia crowns the elevation of Petrachos, where today ruins of the walls of the Classical and Mycenaean period and foundations of temples, architectural elements and epigraphs are preserved. The increased defensive needs of Cheronia made necessary the fortification of the Petrachos elevation, which has a height of 150 m and two peaks.

The position of the acropolis is ideal and ensured the supervision over the entire plain of the Boeotian Kifissos. Already from prehistoric times there are cyclopean fortifications construction.

A small cave located in the acropolis is considered to be the concentration point of the ancient Cheronian writer Plutarch.