The Skull Chapel (Kaplica Czaszek) or St. Bartholomew's Church, is an ossuary chapel. Built in last quarter of the 18th century on the border of the then Prussian County of Glatz, the temple serves as a mass grave with thousands of skulls and skeletal remains 'adorning' its interior walls as well as floor, ceiling and foundations. The Skull Chapel is the only such monument in Poland, and one of six in Europe.
The chapel was built in 1776 by Czech local parish priest Václav Tomášek. It is the mass grave of people who died during the Thirty Years’ War (1618-1648), three Silesian Wars (1740–1763), as well as of people who died because of cholera epidemics, plague, syphilis and hunger.
Together with sacristan J. Schmidt and grave digger J. Langer, father Tomášek who was inspired by the Capuchin cemetery while on a pilgrimage to Rome, collected the casualties’ bones, cleaned and put them in the chapel within 18 years (from 1776 to 1794). Walls of this small, baroque church are filled with three thousand skulls, and there are also bones of another 21 thousand people interred in the basement. The skulls of people who built the chapel, including father Tomaszek, were placed in the center of the building and on the altar in 1804. Inside are a crucifix and two carvings of angels, one with a Latin inscription that reads 'Arise from the Dead' are among the bones.
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.