The single-nave St. Martin’s Church was built by Johannes Orgas, the bishop of Saare-Läänemaa (Ösel-Wiek), in the beginning of 16th century. His shield is located in the church wall, above the north portal. The oldest artefact inside the church is a Gotland-style baptising stone. Also valuable are the altar wall and Empire style pulpit. The church’s collection of 17th-18th century epitaph coat of arms is third in size after Tallinn Dome Church and Niguliste Church.
Reference: Visit Estonia
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.