Mauerbach Charterhouse is a former Carthusian monastery. Founded in 1314 by the Austrian duke Frederick the Fair and rebuilt in the 17th and 18th centuries, the Baroque monastic complex is one of the most important structures of its kind in Austria.
The monastery was plundered and set on fire by Ottoman troops during the 1529 Siege of Vienna and suffered further serious structural damage by the 1590 Neulengbach earthquake. Under Abbot Georg Fasel (1616-1631) an intensive rebuilding programme began, finishing in 1660, during which the great majority of the present-day buildings were constructed. The chronicle of the charterhouse written by Abbot Leopold Brenner was available from as early as 1669, but was not printed until 1725. Brenner had lived here from 1641 and made his profession in 1650, and was thus an eye witness of the building of the early Baroque monastery. In 1683 renewed Turkish assaults during the Battle of Vienna caused more destruction, launching a further programme of repairs and refurbishment s which finished only in 1750.
In 1782 the monastery was dissolved as 'non-productive' by Emperor Joseph II during his rationalist reforms and from 1786 the premises were used for the care of the old and incurably ill of the city of Vienna. Many structural alterations were carried out to adapt the buildings to their new function.
In 1944-45 the former monastery was put to use as an emergency hospital. Between 1945 and 1961 the charterhouse was used to house homeless people. During this period the structure was badly neglected, and allowed to fall derelict from exposure to the elements. Since 1984 the complex has housed the workshops of the Bundesdenkmalamt (Monuments Office).
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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.