Castra of Odorheiu Secuiesc - Credit: Wikimedia Commons
The castra of Odorheiu Secuiesc was a fort built in the 1st century AD. A nearby contemporary settlement was also archeologically identified. The castra and the settlement were abandoned in the 3rd century. Their ruins are located in Odorheiu Secuiesc () in Romania. At the same settlement, the ruins of a Roman tower can also be identified at Piatra Coţofană (). Read more on Wikipedia
Source: en.wikipedia.org