Prehistoric Orchomenos was founded at the foot of the Acropolis and later during historic times moved up to the mountain where its most important monuments (Agora, Theatre, etc) are also situated.
The plain shows prehistoric drainage infrastructure, a prehistoric tumulus bridge, and a prehistoric settlement at the Katalymata site. The modern site shows evidence of an agora, bouleuterion, walls, and hekatompedon temple of Mesopolitidos Artemis. At the Mytikas site there are remains of a Mycenaean settlement and ancient sanctuary of Palaiopyrgos. There’s also an ancient sanctuary – followed by an early Christian Basilica – between Orchomenos and Palaiopyrgos in Mantinea.