The area of the Isthmus was extremely important for the ancient Greeks as it was a nodal point which connected the Peloponnese with Central Greece and Athens while separating the Corinthian and the Saronic Gulf. This helped the development of the area and its facilities.
Today at the archaeological site of Isthmia you can visit several findings and also the museum.
Some of them are: the Temple of Poseidon, which was built in the 7th century BC, the ancient theater, which is not fully preserved because many of its materials were later used in the medieval fortress and the ancient stadium which is located about 300 meters south of the site.
The museum is located in the archaeological site and there you can see findings of great importance, such as a wooden door from the Temple of Isis in Kechries and glass panels of colored glass depicting birds, fish, plants and human figures which are considered a precursor of the European stained glass.