Kos Western Archaeological Zone is located in Kos Town, on the island os Kos.
The western archaeological zone is a large ruined area of historical significance. It was abandoned in the Middle Ages.
Much of Kos Town was stone mined to build Meratzia castle by the Knights of St. John. Much of the Western Zone escaped this mining, so when it was excavated it proved to be rich in finds. A Hellenistic Gymnasium called Xystos was discovered. A row of 17 columns have been restored that lead up to the gym.
Another feature on the site is a paved road, known as Decumanus Maximus which is intersected by a second road, known as the Cardo. Ruined houses line these roads and mosaics have been discovered inside them.