What is the most well defended city in history?

Constantinople was unconquered for 874 years The cities with a better defense than Constantinople's existed throughout history. However, there was not a single city that was so unfathomably rich and important as Constantinople was and withstood every siege for over eight hundred years!



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The effectiveness of the city's air defense systems led some observers to conclude that Kyiv had become the most defended city on Earth.

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Uruk in ancient Sumer (Mesopotamia) is one of the world's oldest known walled cities. Before that, the proto-city of Jericho in the West Bank had a wall surrounding it as early as the 8th millennium BC. The earliest known town wall in Europe is of Solnitsata, built in the 6th or 5th millennium BC.

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One of the oldest cities in Canada—having celebrated its 400th anniversary in 2008—Quebec city has a distinct old-world character and charm. It is the only remaining walled city in North America north of Mexico and was recognized as a UNESCO World Heritage site in 1985.

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So let's take a look at oldest cities in the world that are still thriving today.
  • Damascus, Syria – 11,000 years old.
  • Aleppo, Syria – 8,000 years old.
  • Byblos, Lebanon – 7,000 years old.
  • Athens, Greece – 7,000 years old.
  • Susa, Iran – 6,300 years old.
  • Erbil, Iraqi Kurdistan – 6,000 years old.
  • Sidon, Lebanon – 6,000 years old.


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Fortifications of Québec National Historic Site As you walk along the fortification's walls, you will discover some of the city's best views and even a soldiers' casemate that is only open for this tour. From May 20 to September 4, 2023. Every day.

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Some later medieval castles had walls that were only about 15 to 20 feet (4.6 m to 6 m) high, but the walls of the stronger castles typically measured about 30 feet (9 m) in height and sometimes more.

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Ancient and even prehistoric peoples had sought to establish safe zones by building city walls since at least the tenth millennium BC. Those early walls didn't reduce violence simply by deterring invasion. The security afforded by walls changed the inhabitants of the ancient cities. They became accustomed to peace.

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