Antskog ironworks, one of the oldest industrial sites in Finland, was established in 1640. The heyday of Antskog was in the 17th century, when Pohja town became a center of iron manufacturing in Finland. Industrial buildings were mainly destroyed in the Greater Wrath (1714-1721) and it caused the financial downturn. The ironworks went bankrupt couple of times.
The next upswing was in the 1860s, when Antskog started to produce copper. Antskog started also a textile business in the 19th century. The industrial story ended in 1959. Today there are about 120 people living in the ironworks area. Many summer events are also held in Antskog. The ironworks area and local wooden church (built in 1766) are open to the public.
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.