The Dalaborg Castle was built in 1304 by dukes Erik and Valdemar (the sons of Magnus Ladulås) during the war against the king Birger. The castle was destroyed in 1434 in the so-called Engelbrekt uprising. The Queen Margareta, regent of Norway and Denmark, was named also as a regent of Sweden in Dalaborg in 1388.
Today the moat, ramparts, a terrace and the cellar of a blockhouse remain of castle. A model of Dalaborg before it was destroyed can be seen at Mellerud Museum.
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.