[Image] Church of Bones|Sedlec Ossuary
[Image] Church of Bones|Sedlec Ossuary
The Sedlec Ossuary (Czech: Kostnice v Sedlci; German: Sedletz-Beinhaus) is a Roman Catholic chapel, located beneath the Cemetery Church of All Saints (Czech: Hřbitovní kostel Všech Svatých), part of the former Sedlec Abbey in Sedlec, a suburb of Kutná Hora in the Czech Republic. The ossuary is estimated to contain the skeletons of between 40,000 and 70,000 people, whose bones have, in many cases, been artistically arranged to form decorations and furnishings for the chapel. The ossuary is among the most visited tourist attractions of the Czech Republic, drawing over 200,000 visitors annually.
The ossuary at Brno is interesting too, though those folks just stacked the bones.
https://podzemibrno.cz/en/places/ossuary-at-the-church-of-st-james/
Compare to the Capuchin Crypt in Rome: https://en.wikipedia.org/wiki/Capuchin_Crypt