Poskær Stenhus is Denmark's largest round barrow, dating from the age of Funnelbeaker culture (around 3300 BC). The best view of this monument is from the north approach by the road through the hills of Mols Bjerge. The burial chamber has a diameter of more than 2 metres and a ceiling height of almost 1.8 metres. The chamber is surrounded by 23 kerb stones, some of which are more than 2.5 metres high. In 1859, the owner, Ole Hansen, started blasting the barrow stones to sell them as building material. He needed the money for his family and couldn't turn a proper living from the land where the barrow was. The barrow was rescued by local officials.
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.