When the Capuchin monastery in Palermo, Italy, outgrew its original cemetery in the 16th century, monks excavated the catacomb below it and began a bizarre tradition that lasted until the 19th century.
The Capuchin monks mummified the bodies of the dead, dressed them up in everyday clothing and then put them on display on the monastery walls. Apparently, it was quite a status symbol to be entombed in the Capuchin monastery - prominent citizens of the town would ask to be preserved in certain clothing or even have the clothes changed on a regular basis according to contemporary fashion!
When the last body was interred in the late 1800s, there were 8,000 mummies on the walls of the Capuchin monastery and in the catacombs.
You can read about the rest of the tombs here.