Costești-Cetățuie Dacian fortress

The Costești-Cetățuie Dacian fortress was a Dacian fortified town. Located near Costești village, Hunedoara County, Romania, it belongs to the Dacian Fortresses of the Orăștie Mountains World Heritage Site. The fortress was built in the 1st century BC, during Burebista's rule, with the purpose of defending the area against the Romans.

Source: Wikipedia