The island of Gaddtarmen (Hauensuoli, The Pike´s Gut) off Hanko forms a natural harbour on a sailing route in the east-west direction. Sailors have made more than 600 carvings on the rocks while awaiting favourable winds. The oldest drawings date from the 15th and 16th centuries. Most of the carvings decpict coats of arms of Swedish and Finnish gentry. Probably the most famous carving was made in 1754 by Field Marshal Augustin Ehrensvärd, the originator of Suomenlinna sea fortress.
The site is a unique document relating to the history of the Baltic Sea. It’s added to the tentative list of Unesco World Heritage Site by the National Board of Antiquities.
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.