From the Pyramid of Bones

Sedlec Ossuary, Kostnice Sedlec, or "Bone Church" in Kutná Hora, Czech Republic. The ossuary contains somewhere around 50,000 human skeletons which have been used to decorate the ossuary, in the form of a bone chandelier, bone chalices, and 6 large pyramids of bone. These pyramids were stacked in the ossuary by (according to legend) a half-blind monk around 1511, when a mass grave was unearthed and the bones needed a new home. In 1870, František Rint was emplyed to put the bones in order, and so the ex-woodcarver did; among his works of bone art, he left behind his signature in, of course, bones.