The Acropolis Museum, opened in 2009, focuses on the findings of the archaeological site of the Acropolis of Athens. The museum was built to house every artifact found on the rock and on the surrounding slopes, from the Greek Bronze Age to Roman and Byzantine Greece. It also lies over the ruins of a part of Roman and early Byzantine Athens. Nearly 4,000 objects are exhibited over an area of 14,000 square metres.
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.