Port and market archeological sites: The most important archeological site of the town is located in the north east section of the city in the east wing of Elefpheria square near the port entrance. The 1933 earthquake revealed an ancient wall north of which laid the enclosed area of the port. The wall surrounds the archeological site and there are roman residencies dated in the 2-5 century. Inside the wall there was a Hellenistc temple (only parts of the temple are saved) as wall as an arcade with stores wich touched the wall. There are also remains of a temple of Venus as well as remains of the market with remains of an arcade. The dimensions of the arcade were 80 meters width and 150 meters lengh.
Altar of Dionysus: Near the port and market archeological site lies the temple and the altar of Dionysus of 2nd century BC which was financed by the king of Pergamos. The frieze is preserved with scenes of amazon fighting on it. Parts of the temple are also preserved.
West archeological site of Kos: Near the hill of the acropolis of the ancient city of Kos lies the so called west archeological site. Among other findings there are remains of an Ancient block and an impressive Hellenistic residence, the residence of Europe with Mosaics and Frescoes, the roman conservatory, a second Hellenistic residence with mosaic floor and other findings.
Roman Conservatory: Conservatory of 1-2nd century BC built of marble with 14 rows of Docks. Its Capacity is 750 spectators.
Roman residence: In its first phase in Hellenistic period it was inhabited until the 3rd century AD. The sizeableness of the spaces of the mansion and the luxury of the decorations show the wealth of the owner. The mansion had 36 rooms.
Asclepion: At a 5 km distance from the town of Kos lies the most important monument of the island the Asclepion. Its life starts in the 4th century BC; the sculptures are made from the sons of Praxiteli. In the second century a temple with columns was built in the middle dedicated to Asclepios. The Asclepions were sanctuaries devoted to the god of medicine Asclepios. These sanctuaries were visited by patients in order to seek cure. Some of the most famous Asclipions are in Kos, Athens, Epidaurus, Pergamus and in many other regions.