Fürstenberg Castle was built in 1219 by the Archbishop of Cologne to protect his property and toll station. It was destroyed during the Palatine Wars of Succession. Victor Hugo was once impressed by its powerful shielding wall and keep. The former massive curtain wall has recently been restored and the remains of the original rendering have been exposed and are now visible again.
References: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.