Kastelburg castle was built between 1260 and 1270 by the Lords of Schwarzenberg. Like the Schwarzenburg on the opposite side of the valley its purpose was to defend the town Waldkirch and to control the trade route through the Elz valley.
The first inhabitant of the castle was Johann I of Schwarzenberg. The Schwarzenbergs died out already in 1345 and the castle was sold to Martin Malterer from Freiburg who fell in 1386 in the Battle of Sempach. In 1429 the castle was passed on to Berthold of Staufen.
In the Thirty Years' War the castle was destroyed by troops of the Kaiser on 14 March 1634 so that it did not fall into the hands of the advancing Swedish troops.
In recent years attempts have been made to conserve the edificial structure of the ruin that is standing romantically above the historic center of Waldkirch.
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.