Freundsberg castle in Tyrol was constructed in 1150 by the lords of Freundsberg. Originally the castle consisted out of a single keep, which is still intact up to this date. The chapel next to it was built afterwards in the year 1117. In 1467 the castle was sold to Archduke Sigismund of Austria, who rebuilt the castle and called it Sigismundruh for the duration of his reign.
From 1634–37 on, the castle was remodified as a 'castle church' or Schlosskirche. After passing to several other owners from 1812 on, Castle Freundsberg became a property of the municipality of Schwaz. They restored the castle from 1966 onwards.
Since 1948 is the castle a museum where the history of the city Schwaz and the silver mining industry in this region is documented.
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.