Lyckå (Lyckeby) Castle was built in 1545-1560 according the order of Kristian III of Denmark. It replaced a small castle manor and was purposed against the rebellious peasants. Battles between Denmark and Sweden were fought in Lyckå in 1507 and 1564. The castle was demolished in 1600 after Lyckå lost its city privileges to Kristianopel. Kristian IV of Denmark ordered to use castle stones to build new fortifications in Kristianopel. Today foundations of castle and two corner towers remain.
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.