The position and the layout of Stahlberg Castle clearly indicate that it is founded in the 12th century. It is situated on a rocky projection to the northwest of the town. The ring wall, parts of which have been rebuilt, surrounds the whole area and is rectangular in shape with several openings. A prominent circular tower that rises next to the gateway like a keep was added at the start of the 13th century and secures the narrow entrance with its curtain wall and a ditch. This part of the design is based on a similar feature at Stahleck Castle. The original keep can probably be identified in the ruins of an angular tower in the upper part of the castle.
References:The ancient Argos Theater was built in 320 BC. and is located in Argos, Greece against Larissa Hill. Nearby from this site is Agora, Roman Odeon, and the Baths of Argos. The theater is one of the largest architectural developments in Greece and was renovated in ca 120 AD.
The Hellenistic theater at Argos is cut into the hillside of the Larisa, with 90 steps up a steep incline, forming a narrow rectilinear cavea. Among the largest theaters in Greece, it held about 20,000 spectators and is divided by two landings into three horizontal sections. Staircases further divide the cavea into four cunei, corresponding to the tribes of Argos A high wall was erected to prevent unauthorized access into the theatron and may have helped the acoustics, but it is said the sound quality is still very good today.
Around 120 CE, both theaters were renovated in the Roman style.