Kurzętnik Castle was built by Teutonic Knights in the 14th century. The construction began around 1331 and was completed before 1361. The large castle was 110m long and 42m wide. The first floors were built of granite and upper were brick-made. There was a chapel church in the inner yard. The suffered damages in wars between Teutonic Order and Poland-Lithuanian Commonwealth in 1410s and again in 1659 in Swedish army attack. In the 19th century the existing castle was demolished. Today some outer walls and foundations exist.
The Odeon of Herodes Atticus is a stone theatre structure located on the southwest slope of the Acropolis of Athens. It was built in 161 AD by the Athenian magnate Herodes Atticus in memory of his wife, Aspasia Annia Regilla. It was originally a steep-sloped theater with a three-story stone front wall and a wooden roof made of expensive cedar of Lebanon timber. It was used as a venue for music concerts with a capacity of 5,000. It lasted intact until it was destroyed and left in ruins by the Heruli in 267 AD.
The audience stands and the orchestra (stage) were restored using Pentelic marble in the 1950s. Since then it has been the main venue of the Athens Festival, which runs from May through October each year, featuring a variety of acclaimed Greek as well as International performances.