St. Catherine's Abbey in Stralsund is one of the few Northern German monasteries, whose Gothic substance has almost survived in its entirety. It was built by the Dominicans in 1251 and used as orphanage and public school after the Reformation. Nowadays, it is home to the famous German Oceanographic Museum and the Museum of Cultural History, offering a comprehensive collection of artefacts of the region’s history and heritage.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.