There was a problem in the segregated Jewish ghetto of 15th century Prague: there were more people dying than there was land to bury them.

The solution? They were buried on top of one another. Here's the unique story of the layered burial of the Old Jewish Cemetery in Prague, Czech Republic:

Over the centuries, there has been close to 12 layers of people buried within the confines of the Old Jewish cemetery. It has been estimated that there are approximately 12,000 tombstones presently visible and there may be as many as 100,000 burials in all.

Link

From the Upcoming ueue, submitted by lannaxe96.