The medieval Kienburg castle was located between Huben and St. Johann im Walde, in the municipality of Matrei. Its name derives from the old German term for 'kühn', that's to say bold, or from Archbishop Erich Kuenburg, one of its owners. It is a hill castle, located in the forest above the Iseltal valley and mentioned for the first time around 1000 AD.
The castle had a key position in the trade of the Iseltal, Defereggental and Kalsertal valleys. Once, the mighty Earls of Lechsgemünde inhabited the castle, in the following centuries, it was witness and centre of fight and devastation. Among the owners there were the Bishopric of Salzburg and Knight Earl Christoph von Kienburg, its last inhabitant when it was destroyed by a fire in 1579. In 1945, an American aerial bomb destroyed most of the still existing walls.
Currently, the Kienburg Castle Ruin is being renovated: It is in private hands, the surrounding is a restricted archaeological area.
References:The Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built. They were also the largest and strongest fortification in both the ancient and medieval world.
Initially built by Constantine the Great, the walls surrounded the new city on all sides, protecting it against attack from both sea and land. As the city grew, the famous double line of the Theodosian Walls was built in the 5th century. Although the other sections of the walls were less elaborate, they were, when well-manned, almost impregnable for any medieval besieger.