Thieres
Google
A must go in the city. The entrance is actually downhill, fromt here you can take a cart that is available every 15 minutes to reach this place. The ruins are well preserved and it makes you really appreciate the history of the city.
I highly recommend to visit the museum first, once you see the historical details the old ruins will feel more powerful.
You can climb the main tower, just a couple floors, to get a great view of the place.