Brno Ossuary is an underground ossuary. It was rediscovered in 2001 in the historical centre of the city, partially under the Church of St. James. It is estimated that the ossuary holds the remains of over 50 thousand people which makes it the second-largest ossuary in Europe, after the Catacombs of Paris. It's been opened to public since June 2012.
A three-chamber crypt was established under the paved floor of St. James’ Church for these purposes probably in the 17th century. At the beginning the crypt filled slowly, but from the mid-18th century two large symmetric walls of remains from emptied church sepulchres were gradually built there. The rapid filling of the charnel houses was partly due to frequent plague and cholera epidemics that literally decimated the population. The ongoing lack of space for bones from emptied graves required that the charnel house be extended in 1741. The best solution appeared to be the extension of the new ossuary under the cemetery and its connection to the church crypt. The new ossuary, however, was filled in six years and the town council began to discuss its further extension with a connection to the Chapel of the Dead near the church. However, the construction of the connecting corridor was prematurely terminated in the middle of its originally planned length, and thus the original plan has never been implemented.
When both the crypt and the ossuary under the cemetery were full, the entrance staircase from the main nave of the church was sealed with a Latin-inscribed stone slab. Josephine reforms in 1784 led to abolishing the church cemetery for hygiene reasons. The remains from the graves were placed in the crypt, the cemetery walls were pulled down, and the area around the church was paved with unnecessary tombstones. The ossuary, its size, and location fell into oblivion after some time.
In 2001 an archaeological and underground survey was carried out before starting the renovation of the Jakubské square, and its findings were a great surprise. Several pilot bore holes to the depth of four metres confirmed the existence of a large burial complex. The individual rooms were filled with huge volumes of human bones often up to the vault arches. The estimated number of people buried there exceeded 50 thousand. The anthropological analyses carried out so far have shown that the bones of the victims of mediaeval plague and cholera epidemics, as well as those of the Thirty Years’ War and Swedish sieges were placed in the ossuary.
The accumulated humidity and mould, if left untreated, would cause the gradual decomposition of bones and the collapse of the vault less than two metres under the busy roadway of the Jakubské square. That is why the only way to preserve this unique monument was to renovate the ossuary and open it to the public. During the refurbishment, all remains were collected, cleaned and returned to their last resting place. Together with other archaeological finds, the exhibition shows the way of burying in one of the largest city cemeteries in Brno.
References:Carlsten is a stone fortress built on the orders of King Carl X of Sweden following the Treaty of Roskilde, 1658 to protect the newly acquired province of Bohuslän from hostile attacks. The site of Marstrand was chosen because of its location and its access to an ice free port. Initially a square stone tower was constructed, but by 1680 it was reconstructed and replaced by a round shaped tower. Successive additions to the fortress were carried out, by the inmates sentenced to hard labour, until 1860 when it was reported finished. The fortress was decommissioned as a permanent defense installation in 1882, but remained in military use until the early 1990s.
The fortress was attacked and sieged twice falling into enemy hands. In 1677 it was conquered by Ulrik Frederick Gyldenløve, the Danish military commander in Norway and in 1719 by the Norwegian Vice-Admiral Tordenskjold. At both occasions the fortress was returned to Swedish control through negotiations and treaties.