The city of Sikyon, originally situated by the sea with an acropolis further inland, according to Homer, was ruled by the hero Adrastos, the only survivor of the seven heroes who attacked Thebes to support Polyneikes. After the Doric invasions, Sikyon came under the influence of Argos, and lost around 550 BC. as a member of the Peloponnesian Association, every own political leeway. In the Peloponnesian war, a loyal ally of Sparta, Sikyon was conquered in 368 by the Theban general Epameinondas. In 303, the Macedonian Demetrios Poliorketes conquered the city, had it demolished, and founded a new city on the site of the ancient acropolis. In the time after the destruction of Corinth by Mummius, Sikyon temporarily had the organization of the Isthmian games, but after the reconstruction of Corinth, the city gradually fell into disrepair.
The most important antiquities are those around the antique agora (right). Of the ruins of the city is especially the theater, one of the largest in Greece, still very impressive with its cavea 120 meters. The bottom rows of the grandstands are still well-preserved, with seats at the bottom with handrails, armrests and sculpted legs. The remains of the stadium can be seen in the ravine west of the theater, while the foundations of two temples, a stoa and a bouleuterion, and extensive remains of a gymnasium are visible on the agora. The finds of the site are largely kept in the small museum that is housed in the remains of the Roman bathhouse (completely renovated and reopened in 2006).

The museum, located in an antique Roman bath building, with mosaics and remains of sculpture on the inside. Click here for photos