The most important vaulted Mycenaean tomb of Western Greece is located in Tzanata of Poros. Archaeological research concluded that the tomb served as a mansion, due to the rich findings, while the vaulted tomb was apparently used for noble inhabitants, indicating that the area was a developed Mycenaean center. The findings are exhibited at the Archaeological Museum of Argostoli (currently closed due to extensive damage from the 2014 earthquake).

During the British rule already, the first of the 17 tombs of the Mycenaean era were discovered in the area of Mazarakata, in Livathos. The public utility constructions that the English wanted to build in the 19th century led to the discovery of the largest Mycenaean cemetery in the Ionian Sea. The Swiss-born commander De Bosset (best known for the construction of the Argostoli Bridge named after him) in 1813 excavated the area in order to obtain limestone for paving the roads.

During the British rule, four of the seventeen Mycenaean tombs of the Mazarakata were violated and the findings came into the possession of De Bosset. They are exhibited in the Neuchâtel Museum in Switzerland, where he donated them.

The great Kefalonian archaeologist Panagis Kavvadias worked on the Mycenaean tombs of Mazarakata in 1899 and by the beginning of the 20th century, he had investigated the 4 tombs discovered by De Bosset and brought another 12 to light. The 17th tomb was discovered by chance in 1951 and was investigated by the archaeologist Spyros Marinatos, who also was Kefalonian. The Mycenaean tombs of Mazarakata are carved into the natural rock, underground and are of various shapes and sizes. Burial pits also vary. As during the Mycenaean period, the custom of retrieval prevailed, each tomb was used many times. The important grave goods of the burials are exhibited today in the Archaeological Museum of Argostoli, due to open again after its reconstruction.

Three kilometers east of Argostoli on the way to Sami, there are the ruins of ancient Krani with its acropolis. Ancient Krani was one of the four city-states that made up the "Kefalonian tetrapolis" (500-200 BC). Themountains served as natural borders to separate the four states of the island, which maintained their institutional and financial independence, each had their own currency and were often in rivalry with each other.

The Cyclopean walls are made of giant boulders dating back to the 7^th-6^th century BC.  The name "Cyclopean" was given in the past by the Greeks because they believed that they had been made by the mythical Cyclops.

The road to the archaeological site has been marked, it is an easy walk starting just before the village of Razata. It is worth seeing how the ancient Greeks built large walls from these carved stones: even nowadays with our advanced technology it would still be a remarkable achievement.

On the southern and western slopes of the hills, the city of Krani develops amphitheatrically, which has a rudimentary street plan while it is crossed by a main road. In the northern foothills of Kastelli there is a sanctuary dedicated to Demetra, the goddess who was devoted to protecting agriculture.

The Roman villa at Miambeli (Agios Athanasios) in Skala, Kefalonia, was discovered in 1957, after an excavation by V. Kallipoliti. Six rooms were retained from the villa, of which I is the vestibule, the II, III and IV are further chambers, the V room and the sixth (VI) were the outdoor courtyard. The monument originally extended to the east, but its walls were cut during the early Christian period, during which the central chamber (III) was converted into a church with an arch. It is likely that the villa also included baths with hypocausts, perhaps a Nymfeon, in the eastern part, where in 1822 a large cistern was built. According to the excavator the location of the main entrance of the building, on the south side, is parallel to the bed of a passing stream. This means that the structure was probably accessed by a wooden bridge, for safety reasons.

The Acropolis of Sami crowns the 2 hilltops of Paleokastro and Kyatis. It was built according to the model of the city-states, that were the administrative structure that was applied in Greece during the classical period, between the 8^th and the 5^th century BC. 

The acropolis had strong fortification, which indicates the need to protect its inhabitants during the classical and Hellenistic period from external threats. Sami's opponents could include at times even the other cities of Kefalonia. The fortification was reinforced with a tower, transverse legs on the slopes of the two hills and a coastal wall for protection from the side of the sea, while the entrance to its interior was made by five gates, of which the so-called east of the great citadel is best preserved. This is an extensive project, which seems to have begun in the 5th century BC. BC, with extensions and repairs, which are reflected in different building systems, but also later interventions over the centuries up to medieval times, associated with historical circumstances and the corresponding influences that the city then received from forces that controlled the fates of Greek cities. The completion of the fortification of the ancient city dates back to about 300 BC, with the construction of the coastal wall, to protect it from the sea. The material of construction is the limestone rock of the area, conveniently used to save time, effort and cost. The extent and form of the fortification is obviously related to the population of the city, but also to the points where the form of the ground ensured the best natural support of the walls.

One of the most readable interventions in the acropolis is the construction of the monastery of Agioi Fanentes inside the fortification of Kyatis. In fact, part of the ancient walls was incorporated into the courtyard of the monastery.

It was built during the period 1593-1595 on the small peninsula formed by the coast of northwestern Kefalonia. The purpose of its construction was to protect northwestern Kefalonia and the whole island, in general, from the attacks of pirates and Turks. The Venetians believed very much in the potential of this castle and aimed to create a naval base for the ships of Venice that were in the East. In fact, the castle proved to be inconvenient because its communication with the rest of the island and its supply was done with great difficulty. Because it had no water, the Venetians dug large and deep cisterns, which were filled with rainwater. The bay formed in the north of the peninsula eventually turned out to be small and shallow, and therefore useless for the galleys of the Venetians. Later, when in 1684 the Venetians occupied Lefkada from the Turks, its defensive importance was negligible. During the French and English occupations there was a garrison in the fortress. In 1927, rural prisons were created inside the fortress, which operated until 1953. Until 1968 some peoplestill remained in the fortress, which is now uninhabited. Within the walls are preserved the church of Prophet Elias, the prison building, as well as the ruins of the village. The fortress is accessible through a scenic route uphill, leading to the main gate. It is accessible 24/7 with no entrance fees.

It is located on the southeastern side of the bay, at the location "Tigania". It was discovered in 1990 and excavated from 1990 to 1997 by the archaeologist of the 6th Ephorate of Prehistoric and Classical Antiquities, Andreas Sotiriou. The site was included in the NSRF  of the Operational Program of Western Greece-Peloponnese-Ionian Islands 2007-2013 with the title "Formation – Promotion of the Roman Cemetery of Fiskardo". It is accessible without entrance fee.

Private baths were discovered in the area of Agios Andreas of Fiskardo, next to the sea. The site dates back tothe Roman – Late Roman period. The area, as it has been confirmed by archaeologist, was an urban center at that time, which is located in the current location "Tigania" (the area where the Roman cemetery is located). The area is open and can be visited, with no entrance fee.

These are two different lighthouses. The old one, built by the Venetians in the ^16th century, is preserved in very good condition and all its parts can be visited without entrance fee, both the cylindrical tower and the lighthouse keeper's house. At a very short distance is the new lighthouse, which was built in 1892 to replace the old one in use. The height of the tower is 14.2 meters while the focal height of the lighthouse is 27 meters. Both are found through the lighthouse hiking path, an easy walk through the pine trees. Once a year, all lighthouses in Greece are open to the public and visitors can see the interior with the help and guidance of the Greek Navy.

The Castle of Agios Georgios was built on a hill 7 km from Argostoli and  dominates the southern part of Kefalonia and the bay of Argostoli. The first houses outside the archaeological site began to be built in the previous century, when the area was recognized and protected as an attraction, but also an important historical monument.

The fortress has an area of about 16,000 square meters and a perimeter of 600 meters. It has a polygonal shape. It consists of the outer wall, the inner enclosure, which has the shape of a horseshoe, and a rocky peak that rises in the center of the enclosure where the ruins of the so-called Old Fortress are located. Churches and buildings are preserved inside, as well as in the suburb (borgo) east  of the entrance. In the borgo of the Castle there is the metropolitan church of the Holy Church of Evangelistria, a typical example of Ionian Baroque. Inside are kept remarkable post-Byzantine icons from the ruined temples of the Castle. To the south of the  Castle is the historic Monastery of Agios Andreas of Milapidia. In its old katholikon there is a  ecclesiastical museum with remarkable icons. In the courtyard of the fortress, near a small square, one will also see  the ruins of the Catholic church of Agios Nikolaos. Inside the castle there was a multitude of churches, the ruins of which are preserved today. ^[

Its creation dates back to the twelfth century AD by the Byzantines. During the rule of the island by the palatine counts Orsini,  some changes were made, which were generalized in the middle of the 16th century, when it was in the hands of the Venetians. The Venetian fortress was built on the ruins of the Byzantine one by the engineer Nikolaos Tsimaras in 1504.Its walls with three bastions are preserved in very good condition until today.The most important moment of its history was its siege and fall at Christmas 1500 by the united Christian forces of Venetians and Spaniards, under the general leadership of Gonzalo de Córdoba, from the hands of the Ottomans who had occupied the island in 1484. With the demographic recovery of the island, the dwellings inside the fortress reserved for the authorities and the nobles (borgo) increased, and gradually a settlement (exombourgo, suburb) developed around and under the walls. 

The southwestern part of the wall was weaker equipped. The armor of the fortress on this side was natural, because the terrain is rough, rocky and steep, so that it does not lend itself to attack and deployment of the infantry by the standards of that time. Inside the fortress there were public and private buildings, temples, food and ammunition depots, barracks, hospitals, prisons, water tanks. There is also information that on many buildings were built-in coats of arms of nobles.

The fortress of Agios Georgios lost its defensive importance from the end of the 16th century. The defense of the island now required the construction of forts near the seas and ports. The castle was damaged by earthquakes in 1636 and 1637. Although the settlement of nearby Argostoli  in time surpassed the Castle in economic and social importance, Kastro continued to be the capital of the island until 1757. Only then was the headquarters of the authorities moved to Argostoli.  

De Bosset stone bridge (or former Drapanos Bridge) with its characteristic arches, is located in Argostoli and is one of the most remarkable and historical landmarks of Kefalonia. It is the longest sea stone bridge in Europe, with a length of 690 meters. It connects Argostoli with the opposite coast, isolating the port area from the lagoon of Koutavos.

The original wooden bridge was built in 1813 by Charles De Bossé, a resident of Kefalonia during the British rule. He saw the need to connect Argostoli with the rest of the island, as until then people could only reach the city by small boats or by circling the lagoon of Koutavos.

The city council was opposed to the proposal to build the bridge, not only because of the cost, but also because of the possibility of conflicts from the opposite villages. Despite this, De Bosset continued the work and the bridge was ready in just two weeks. The reaction of the villagers was extremely positive and opposing voices were eliminated. Charles Napier later completed what De Bosset had started, building the stone bridge.

Halfway through the bridge, you can admire a tall square obelisk rising from the sea. The obelisk bears an inscription that pays homage to the mind behind the whole construction, De Bosset.

As you cross the bridge, you may be lucky enough to meet the caretta-caretta sea turtles swimming near the bridge. 

In the past, the bridge was also used by cars and trucks, which caused severe sedimentation. As a result, it was closed, restored and now one of the most scenic walks on the island, for pedestrians only.   

The lagoon is home to many rare bird species and it is part of the Kefalonia Geopark, recently included in the geopark network of UNESCO.