Théâtre Antique is a Roman age a mphitheatre in Vaison-la-Romaine, near other significant Roman ruins. It was built around the year 20 AD, due to the marble statue of the Emperor Tiberius was found in front of the royal entrance to the Theatre. It is thought that the stage wall came to 25 meters high, with a depth of 8 meters and a width of 23 meters. In 1912, many sculptures were found in the twelve pits which had been built to house stage machinery. These sculptures can now be seen at the Théo Desplans Museum. The Theatre leans against the hillside, and today is used for Vaison's annual festival. It holds an audience of 5000 during the Festival performances.
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.