Approximately 16 km to the east of the ancient Corinth on the territory of the Isthmus of Corinth (region Isthmia) once housed the ancient Greek temple in honor of Poseidon. The sanctuary was an important religious and political importance and revered by all the Greeks, along with Olympia, Delphi and Nemea. This sanctuary is also considered one of the three most important in the world Temple of Poseidon (the second is in the Greek Cape Sounion near Athens, and the third in Italy).

Based on archaeological excavations suggest that the temple of Poseidon was built in the 7th century BC and it is made in the Doric style. The ancient sanctuary is situated near the road that connects the two largest and richest city of classical Greece - Athens and Corinth. There were performed particularly important Meeting of the Greeks and once in two years were the famous Panhellenic Isthmian games. The temple was destroyed by fire about 470 BC, but recovered in the 440-s BC Temple continued to maintain its influence until the end of the third century BC, then was gradually abandoned and eventually destroyed.

For the first time this important historical site discovered the famous archaeologist Oscar Bronner, who began excavations in the area in 1952. Research continued through 1967, and made a number of interesting discoveries, which, however, caused a lot of questions and disputes. Additional excavations conducted in 1989 allowed finally to form a complete picture of the Temple of Poseidon and the surrounding area. It was discovered the foundations of the temple of Poseidon (managed to recover and interesting mosaic), part of the stadium, on which were the Isthmian games, Roman baths and many other facilities.

The ruins of ancient temples and archaeological excavation of these places are of great historical significance and allow to lift the mysterious veil over the fascinating world of ancient Greece.