The ironworks in Kimo was founded by Petter Heijke in 1703. Petter Heijke chose the place because there was an enough deep harbour in Oravainen, waterpower and wood for making charcoal. The ore was brought from Utö in the southern Baltic sea and from Herräng mines in Roslagen. In Kimo it was forged into iron-pigs. The iron-pigs were then tranported further up the river to the forges in Kimo where it was refined into iron-bars.
Kimo was acquired by captain Lars Magnus Björkman in 1818. He renewed ironworks strongly and built for example a lighthouse to the Stubben island. Iron manufacturing ended in 1890s and the factory site started textile business. The heyday of textile manufacturing in Oravainen was in 1920s-1930s.
The original ironworks site and buildings are well-preserved. Today the Kimo Ironworks includes three hammersmith´s workshops: the Lower Mill, the Middle Mill and the Upper Mill. The Lower Mill is the centre of the museum exhibiting the the iron manufacturing. The museum and art gallery are open on order or when there are events arranged on the site. There are also a café and restaurant. Several events are arranged in the ironworks area during the summer season.
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.