The Otepää Maarja Lutheran Church was built in 1890 and represents the Gothic revival style. On 4th June 1884 the blue-black-white flag of the Estonian Students’ Society was consecrated in the church, which later on became the flag of the nation and in 1992 the official national flag of Estonia. The bas-reliefs of the flag, the author of which is sculptor Voldemar Mellik, were opened on the church wall in 1934 (on the 50th anniversary of the national flag). The bas-reliefs were destroyed in 1950 and restored by sculptor Mati Variku and opened again on 15th July 1989.
Reference: Maaturism.ee
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.