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Las Siete Calles or Casco Viejo are different names for the medieval neighbourhood of Bilbao. The names mean Seven Streets or Old Town respectively and it used to be the walled part of the town until the end of the 19th century.
The name come from the oldest part of the neighbourhood which included exactly 7 streets and some much more narrow alleys connecting them, called cantons.
The old quarter is an area of incredible interest in Bilbao, and it is one of the most visited areas of the city
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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.