The Kollegienkirche was built between 1694 and 1707 for the local Benedictine university founded in 1622. The university was disbanded in 1810 but reopened in 1962 as part of the University of Salzburg.
Certainly the largest and best Salzburg church designed by Erlach (who also built the Holy Trinity Church and renovated the Franciscan Church), the Collegiate Church is also one of the most celebrated Baroque churches in all of Austria.
The church is built on a modified Greek cross plan with a unique convex facade. Inside, the high altar by Anton Pfaffinger (1740) incorporates classical columns representing the Seven Pillars of Wisdom. Altar paintings are by Johann Michael Rottmayr.
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.