The Tropaeum Alpium ('Victory Monument of the Alps'), was built by the Romans for the emperor Augustus to celebrate his decisive victory over the ancient tribes who populated the Alps. The monument's remains are in the commune of La Turbie, a few kilometers from the Principality of Monaco.
The Trophy was built c. 6 BC in honor of the emperor Augustus to celebrate his definitive victory over the 45 ancient tribes who populated the Alps. The Alpine populations were defeated during the military campaign to subdue the Alps conducted by the Romans between 16 and 7 BC.
The monument as partially restored by archaeologists at the beginning of the 20th century, is 35 meters high. When built, according to the architect, the base measured 35 meters in length, the first platform 12 meters in height, and the rotunda of 24 columns with its statue of an enthroned Augustus is 49 metres high.
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.