Långe Erik ("Tall Erik") is a Swedish lighthouse built in 1845 and located on a little island, Stora grundet. The island is connected to Öland by a small bridge built in 1965. The older, larger lens is still installed, but no longer in use. The lens was used until the 1990s before an aerobeacon was installed on the lantern's balcony. The light is remote-controlled by the Swedish Maritime Administration. The tower is open for climbing during the summer season for a small fee.
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.