The Castle of Trezzo sull'Adda is located on a hill within a bend of the Adda river and from this protected on two sides. On the remaining side it is closed by a wall and a 42-meter high tower. Part of the castle was the fortified bridge over the river, destroyed in 1416.
The site was inhabited since prehistoric time by Celtic populations and after the VII century hosted a Longobard settlement, which was also at the origin of the first fortification on the hill. In 1370 Bernabò Visconti, lord of Milan, ordered the construction of a new caste, which was built on the remains of the previous fortress and completed in 1377.
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.