The Venetian Arsenal is a complex of former shipyards and armories clustered together in the city of Venice. Owned by the state, the Arsenal was responsible for the bulk of the Venetian republic's naval power during the centuries. It was one of the earliest large-scale industrial enterprises in history.
Construction of the Arsenal began around 1104, during Venice's republican era. It became the largest industrial complex in Europe before the Industrial Revolution, spanning an area of about 45 hectares, or about fifteen percent of Venice. Surrounded by a 3.2 km rampart, laborers and shipbuilders regularly worked within the Arsenal, building ships that sailed from the city's port. With high walls shielding the Arsenal from public view and guards protecting its perimeter, different areas of the Arsenal each produced a particular prefabricated ship part or other maritime implement, such as munitions, rope, and rigging. These parts could then be assembled into a ship in as little as one day. An exclusive forest owned by the Arsenal navy, in the Montello hills area of Veneto, provided the Arsenal's wood supply.
The Arsenal produced the majority of Venice's maritime trading vessels, which generated much of the city's economic wealth and power, lasting until the fall of the republic to Napoleon's conquest of the area in 1797.
Significant parts of the Arsenal were destroyed under Napoleonic rule, and later rebuilt to enable the Arsenal's present use as a naval base. It is also used as a research center and an exhibition venue during the Venice Biennale, and is home to a historic boat preservation center.
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.