The ancient city of Gordion, located in the Polatlı district of Ankara, is the capital of the Phrygian kingdom and has a very important place in history. According to archaeological findings, the Phrygians came to Gordion as early as the end of the 12th century BC as a result of the collapse of the Hittites. In the 9th century BC, a major transformation took place and the settlement became a fortress surrounded by enormous walls containing large structures. There are approximately 85 tumuli around Gordion. These hills are the graves of important individuals and belong to a wide period of time from the 9th century BC to the 2nd century BC. The Tumulus of King Midas, located here, is the largest known example of this type of grave in Central Anatolia with a height of over 50 meters. The wooden burial chamber containing the deceased is intact and is the oldest known intact wooden structure in the world.