The Isthmus of Corinth is the narrow land bridge which connects the Peloponnese peninsula with the rest of the mainland of Greece, near the city of Corinth. The Isthmus was known in the ancient world as the landmark separating the Peloponnese from mainland Greece. Since 1893 the Canal has run through the 6.3 km (3.9 mi) wide isthmus, effectively making the Peloponnese an island.

The diolkos was a paved trackway near Corinth in Ancient Greece which enabled boats to be moved overland across the Isthmus of Corinth. The shortcut allowed ancient vessels to avoid the long and dangerous circumnavigation of the Peloponnese peninsula.

Kechrees was the eastern port of Corinth its peak growth was during the hundred-year period when Corinth was a Roman colony. It had always been the commercial port of Corinth. Today, what is left of the port are the remains of the adjustments and additional construction works conducted during Roman times. The alcove of the port was surrounded with tunnels and harbor facilities. At the southern breakwaters there were storerooms, nymphaeum, a temple for Isis and the early Christian Basilica of the 4th century A.D. At the northern breakwaters there was a square tower, Aphrodite’s sanctuary and various other buildings. In 53 A.D. St. Paul the Apostle disembarked on the port of Kechrees during his first trip to the city of Corinth.

The archaeological site of Corinth offers a glimpse into this rich past. Among its many remarkable remains, visitors can explore the majestic Temple of Apollo, a testament to the city's ancient glory. Of particular interest to Christians is the Bema, a raised platform where Paul is believed to have preached the Gospel to the Corinthians. Additionally, the Agora, the ancient marketplace, provides insight into the bustling commercial life of the city during Paul's time.

The Museum of Ancient Corinth was built in 1932 to house the numerous artifacts brought to light by the archaeological excavations. During 2007-2008, works were undertaken in order to upgrade the Museum, through funds of the 3rd CSF. The two galleries containing the prehistoric collections and the finds from the Sanctuary of Asklepios.

Acrocorinth was the fortified acropolis for ancient and medieval Corinth. Fortification was ensured through a system of three enclosures, separated by walls, which were in turn reinforced by towers and bastions. Three imposing pillars lead to its interior, where one can see ruins from buildings of all eras. Parts of the classical period wall are also visible, as well as the fortifications from the Byzantine period, extended fortification works of the Frankish and Venetian rule, as well as additional works, which took place mainly in the interior during the Ottoman rule.