Wooden Descent of the Holy Spirit Church was built in suburb of Potelych, Ukraine in 1502 on the place of a church that was burned down by tatars. It is the oldest wooden church in Lviv Oblast. The structure consists of three wooden naves and a brick sacristy.
In 2013 Holy Trinity Church was added to the UNESCO World Heritage List among 16 wooden tserkvas of Carpathian Region in Poland and Ukraine.
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.