St. Stephen's Cathedral is a baroque church built in 1688. Since 730, there have been many churches built on the site of the current cathedral. The current church, a baroque building around 100 metres long, was built from 1668 to 1693 after a fire in 1662 destroyed its predecessor, of which only the late gothic eastern side remains. The cathedral's overall plan was made by Carlo Lurago, its interior decoration by Giovanni Battista Carlone, and its frescos by Carpoforo Tencalla.
Over time, the Passau Cathedral has acquired the largest organ outside of the United States. It is also the largest cathedral organ in the world. The organ currently has 17,774 pipes and 233 registers, all of which can be played with the five-manual general console in the gallery. Portions of the organ have their own mechanical-action or electric-action consoles, for a total of six consoles.
The cathedral has eight large bells in the bell rooms in the north and south towers. The heaviest, Pummerin at 7550 kg cast in 1952 and Sturmerin weighing 5300 kg cast in 1733 hang in the south tower. The other six bells hang in the north tower.
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.