St. Nicholas Monastery Complex is situated in the Dnieper river valley, in a fenced territory. It consists of a number of stone buildings: the St. Nicholas and St. Onuphry Churches, a dwelling house (a hospital), a belfry and a fence with an entrance gate.
The stone building of the St. Nicholas Church was erected on the place of a wooden church from 1669 to 1672. The church is a three-nave cross-dome basilica with an octahedral light tambour and a large bulbous cupola over the middle part of the church. The dominant architectural feature of the church was a two-tower main facade with a figured pediment decorated with a set of diversiform tiered bays.
At present the complex is an active monastery. It was added to the UNESCO World Heritage Tentative List in 2004.
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.