Dunglass Castle, situated in West Dunbartonshire, is a ruinous castle, originally constructed during 1400–1542. A large section of high wall remains, to approximately 7–8 metres high, with a mixture of original and newer construction. A small conical dovecot also exists on the south wall but it is now completely ruined. The castle and courtyard stone was taken in 1735 to use in repair of the quay following an order by the Commissioners of Supply.
Near the west end of the wall, and outside the south wall is a small landing place appearing to have been protected by a hoarding – some corbels for which still remains. At the North-West corner of the enclosure is a dwelling house, partly old, possibly dating back to 1590, but mostly modern – the interior is wholly so. The round tower is probably from the 17th century and appears to have been a pigeon house.
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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.