Långe Jan ("Tall John") is a Swedish lighthouse located at the south cape of Öland. It is one of Sweden's most famous lighthouses and also the tallest lighthouse in Sweden. The lighthouse was built in 1785, probably by Russian prisoner of wars. The tower was built by stone from an old chapel. Originally the light was an open fire, and the tower was unpainted. It was painted white in 1845, and the same year the tower's lantern was installed, to store a colza oil lamp. A couple of years later a black band was added to the tower.
The lighthouse remains in use and is remote-controlled by the Swedish Maritime Administration in Norrköping. During the summer-season it is possible to climb the tower, for a small fee. The buildings surrounding the tower is Ottenby birding station.
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.