[old jewish cemetery, prague]

Old Jewish Cemetery, Prague - image taken by Andreas Praefcke

This place would be amazing to visit, and even more interesting to study. Basically there is this cemetery in the Old Jewish Quarter of Prague in the Czech Republic that was in use from the early 15th century to nearly the end of the 18th. The thing is tombs have been built on top of tombs, there are over 12, 000 tombstones and an estimated 100, 000 bodies. From what I understand it seems that Judaism does not permit the destruction of Jewish graves or the movement of the tombstones by Jews and due to the fact that they were not allowed to buy other land or bury their dead anywhere else, the cemetery quickly ran out of space. This lead to how the cemetery looks now (like a huge maze of tombstones, packed tightly together). Due to the sheer mass of monuments studying this cemetery would be quite a handful but its unique character definitely would be worth the effort. 

For more information here a link to the Wikipedia article
http://en.wikipedia.org/wiki/Old_Jewish_Cemetery,_Prague