The Ploegsteert Memorial to the Missing is a Commonwealth War Graves Commission (CWGC) memorial in Belgium for missing soldiers of World War I. It commemorates men from the Allied Powers who fought on the northern Western Front outside the Ypres Salient and whose graves are unknown.
After Ploegsteert Wood had been the site of fierce fighting at the start of the war, it became a relatively quiet sector where no major action took place. Allied units were sent here to recuperate and retrain after fighting elsewhere and before returning to active operations. Berks Cemetery Extension was founded by Commonwealth troops in June 1916 as an extension to Hyde Park Corner (Royal Berks) Cemetery which lies across the road. The cemetery grounds were assigned to the United Kingdom in perpetuity by King Albert I of Belgium in recognition of the sacrifices made by the British Empire in the defence and liberation of Belgium during the war.
The Ploegsteert Memorial was designed by H. Chalton Bradshaw. The Ploegsteert Memorial is 21 m in diameter and 11.73 m tall and was unveiled on 7 June 1931 by the then-Duke of Brabant, later King Leopold III of Belgium.
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.