Describe the Ossuary of Kutna Hora: Explain why it is creepy/sublime

The Ossuary of Kutna Hora was a church basement that had been transformed by using skeletons, mostly skulls to decorate. The skeletons are said to be people who had suffered from the plague or other disastrous past events. It was very odd and disturbing to me that the remains of people were used in showcase for this church. It felt kind of weird to be taking pictures and admiring (for lack of a better word) people who had suffered and now are on display. Almost as if we are mocking them.