Prague: Skulls on skulls

Skulls on skulls, originally uploaded by Jarod Carruthers.

Kostnice Ossuary in Kutna Hora.
Sedlec monastery is where the Ossuary is located.
When the Black Plague hit, they had no more room to bury the dead so stored some of the bones in the chapel.
They say a monk went mad and made the various sculptures (and things like chandaliers and even a coat of arms) out of the bones.