Köngen is in the area of the Roman settlement Grinario that was built around 100 AD around a Roman castra. Grinario was the endpoint of the Roman road 'Neckar-Alb-Aare' which originated in Windisch (Switzerland). In 260 the place was destroyed by the Alemanni and the Romans were expelled.
Johann Eberhard Roser discovered some traces in 1782 and started excavations here one year later. At present it is the site of an archaeological park and museum. The earliest reconstructions were those of a Roman corner tower, the originals of which were discovered in 1855. The tower was ready in 1911 and the 'Köngener Römerkastell' with its great viewpoint and small indoor museum soon became a popular excursion.
In World War II and the period short after, the tower was damaged and it was not open to public until 1949. In the 1970s, the tower was fully renovated and a small museum was built next to it.
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.