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Zwing Uri is a ruined medieval castle north of Amsteg, today in the territory of the municipality of Silenen.
The castle is notable for its role in Swiss historiography as the first fortress destroyed in the Burgenbruch at the beginning of the Swiss Confederacy. The slighting of Zwing Uri (Twing Üren) is mentioned in the White Book of Sarnen, a Swiss chronicle of 1470. The event is placed in the year 1307 by the Chronicon Helveticum (1570).
The site had been occupied since the Bronze Age. By 1150, there had been a farmstead with three buildings. By the early 13th century, the dwelling was replaced by a defensive tower. During the period of 1310 to 1320, the tower was still standing, and there are traces of a planned expansion into a full castle with a ring wall and a moat. This expansion was interrupted at about six weeks into the construction work, and the castle was abandoned in ca. 1320, i.e. 13 years after the traditional date of the Burgenbruch.
The site remained unoccupied until 1868, when a restaurant was built, using stones from the ruin. The remains were secured in 1928, when the ruin was acquired by the Schweizerischer Burgenverein. Archaeological excavations of the ruin were performed in 1978.
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.