The archaic city Stratonikeia is in the borders of Eskihisar Village on Yatagan - Milas highway that is 6 - 7 km western of Yatagan District of Mugla. The city has been established in the 3rd century BC. Syrian King 1st Seleukos gave his wife Stratonike to his son Antiokhos. Antiokhos has established a city in the name of Stratonike, who was first his step mother, and then his wife.
In accordance with Strabon, who is a traveler and a writer, the city was full of very beautiful buildings. From the coins obtained in the excavations made, it is understood that Stratonikeia coins are minted since the date of its gaining its independency from Rhodes in 167 BC and continued until the Gallienus period (253 - 268 AD).
The acropolis of the city is at the top of the mountain in the south. This top is surrounded with a wall. In its north, on a terrace on the slope, on an inscription just below the highway of today, the ruins of a small temple constructed for the emperor can be seen.
There is a theater below this temple. Here, cavea is divided into 9 cuneusas with stairs and there is a single diazoma. The remainders of the stage building have been exposed to a great extent in the excavations made. Over the archaic city, Eskihisar Village, which is left today, is located.
The city is surrounded with walls and today, only unimportant projections of the city walls can be seen. In the northeastern corner of the settlement area, lies the ruins of a strong fort made of cut stones and lime mortar. From the inscription stones and column bodies taken from other buildings, it is understood that the building has been repaired.
The main entrance door in the north of the city consists of large blocks. It is made with wide and fine masonry. The ruins show that there was an arch on that door. The door has two entrances. There is a nymphaion between the two door entrances. After the door, an area with columns and a road is seen.
At the middle of the city, the most significant building, bouleuterion where the city assembly meets, is located. The door standing alone just in the west of this building is the entrance door of the area. This was claimed to be Serapis Temple; but the inscriptions found in the excavations have shown that this thought was wrong. On the external wall of Bouleuterion towards north, the price list of Diocletianus and the introduction part relating to the application of it are written in Latin. The seats of this building in the lower part are protected.
In the western part of the city, the building named gymnasion, where the young people were trained in intellectual and physical aspects and made sports activities in Ancient Greek and Rome, exists.
There are chamber graves at the side of the holy road in front of the entrance door of the city. The holy road starting from the entrance door passes through necropolis and reaches to Hekate holy area in Lagina. This necropolis area has disappeared today remaining under coal mine basin.