The Hermannsdenkmal ('Hermann Monument') stands on the densely forested Grotenburg, a hill in the Teutoburg Forest range. The monument commemorates the Cherusci war chief Arminius (in German Hermann) and the Battle of the Teutoburg Forest in which the Germanic warriors under Arminius defeated three Roman legions under Varus in 9 AD. At the time it was built, the location of the statue was believed to have been very near the actual site of the battle, though it is now considered to be more likely that the battle actually took place near Kalkriese, a considerable distance to north west of the monument.
Earthworks of the monument began in July 1838, and the foundation stone was laid in October 1838. Problems emerged due the criticism for design and the financial viability of the project came to be questioned. It was inaugurated not before 1875, in the presence of Emperor William I and the crown prince, Frederick.
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.