The Triumphal Arch is a Roman structure in the city of Orange. There is debate about when the arch was built, but current research that accepts the inscription as evidence (27 BC-AD 14) favours a date during the reign of emperor Augustus. It was built on the former via Agrippa to honor the veterans of the Gallic Wars and Legio II Augusta. It was later reconstructed by emperor Tiberius to celebrate the victories of deceased general Germanicus over the German tribes in Rhineland (c. 20–27 AD). The arch contains an inscription dedicated to emperor Tiberius in AD 27.
Along with the Roman Theatre of Orange, the Triumphal Arch was inscribed on the UNESCO World Heritage List in 1981 because of its exceptional preservation.
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.