Well catacombs fascinate me and my last study for university it is about them. Some people found them macabre, i look at them as an extremely natural and beautiful art. The view of the catacombs and of the mummies, make me realize the idea of temporality and the assumption that eventually we all gonna die :D
[there is a great sample]
There are catacombs in Paris, in Italy, in Greece, in Egypt, in Spain, in Malta, in Peru. So many to visit one day! Catacombs, human-made subterranean passageways for religious practice. Any chamber used as a burial place can be described as a catacomb, although the word is most commonly associated with the Roman empire. Many are under cities and have been popularized by stories of their use as war refuges, smugglers' hideouts, or meeting places for cults.
Capuchin catacombs of Palermo, Sicily were used as late as 1920s. Catacombs were available in some of the grander English cemeteries founded in the 19th Century, such as Sheffield General Cemetery (above ground) and West Norwood Cemetery (below ground).
[photos form Google]