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Catacombs are human-made subterranean passageways for religious practice. Any chamber used as a burial place is 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.
The first place to be referred to as catacombs was the system of underground tombs between the 2nd and 3rd milestones of the Appian Way in Rome, where the bodies of the apostles Peter and Paul, among others, were said to have been buried. The name of that place in late Latin was catacumbae, a word of obscure origin, possibly deriving from a proper name, or else a corruption of the Latin phrase cata tumbas, "among the tombs". The word referred originally only to the Roman catacombs, but was extended by 1836 to refer to any subterranean receptacle of the dead, as in the 18th-century Paris catacombs.
Around the world 
Catacombs in the world include:
- Austria – Catacombs of St. Stephen's Cathedral, Vienna
- Australia – Catacombs of Trinity College, Melbourne University
- Czech Republic – Catacombs of Znojmo
- Egypt – Catacombs of Kom el Shoqafa (or Kom al Sukkfa, Shuqafa, etc.) in Alexandria
- England – Catacombs of London and others
- France – Catacombs of Paris. Mine workings were used at end of the 18th century and had no religious purpose other than as an ossuary for storing the bones of cleared graveyards.
- Ukraine – Odessa Catacombs
- Italy – Catacombs of Rome; Catacombs of Naples; Capuchin catacombs of Palermo and others
- Malta – Rabat Catacombs
- Peru – Catacombs of the Convento de San Francisco, Lima
- Spain – Catacombs of Sacromonte in Granada
- Slovenia – Catacombs of Huda Jama near Laško and others
There are also catacomb-like burial chambers in Anatolia, Turkey; in Sousse, North Africa; in Naples, Italy; in Syracuse, Italy; Trier, Germany; Kiev, Ukraine. 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). There are catacombs in Bulgaria near Aladzha Monastery and in Romania as medieval underground galleries in Bucharest.
In Ukraine and Russia, catacomb (used in the local languages' plural katakomby) also refers to the network of abandoned caves and tunnels earlier used to mine stone, especially limestone. Such catacombs are situated in Crimea and the Black Sea coast of these two countries. The most famous are Odessa Catacombs and Ajimushkay, Crimea, Ukraine. In the early days of Christianity, believers conducted secret worship services in these burial caves for safety and reverence for the dead. Later, they served as bases for Soviet World War II guerrillas (see also Great Patriotic War). Ajimushkay catacombs hosted about 10,000 fighters and refugees. Many of them died and were buried there, and memorials and museums were later established (it is now a territory of Kerch city).
Catacomb decorations 
Catacombs, although most notable as underground passageways and cemeteries, also house many decorations. There are thousands of decorations in the centuries-old catacombs of Rome, Paris, and other known and unknown catacombs, some of which include inscriptions, paintings, statues, ornaments, and other items placed in the graves over the years. Most of these decorations were used to identify, immortalize and show respect to the dead.
Although thousands of inscriptions were lost as time passed, many of those remaining indicate the social rank or job title of its inhabitants; however, most of the inscriptions simply indicate how loving a couple was, or the love of parents and such.
Paintings can also be seen throughout the burial chambers on the walls and ceilings. The paintings conveyed the same ideas as the inscriptions found throughout the catacombs.
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In recent years unique strains of bacteria have been discovered that thrive in catacombs, inducing mineral efflorescence and decay. These include Kribbella sancticallisti, Kribbella catacumbae, and three types of non-thermophilic (low-temperature) Rubrobacter.
See also 
- Blyton, Enid "Five go to Smuggler's Top" Hodder and Stroughton (1945) ISBN 978-1-84456-678-5
- Éamonn Ó Carragáin, Carol L. Neuman de Vegvar Roma felix: formation and reflections of medieval Rome Ashgate (14 March 2008) ISBN 978-0-7546-6096-5 p. 33 
- Nicholson, Paul Thomas (2005) "The sacred animal necropolis at North Saqqara: the cults and their catacombs" In Salima Ikram (ed) Divine creatures: animal mummies in Ancient Egypt. American University in Cairo Press, 2005 pp. 44–71. ISBN 978-977-424-858-0
- "Catacomb - Definition and More from the Free Merriam-Webster Dictionary". Merriam-webster.com. 2007-04-25. Retrieved 2010-05-20.
- Other examples include a Neolithic long barrow, an Ancient Egyptian necropolis, or modern underground vaults such as the Catacombs of Paris.
- "Catacombs", Online Etymology Dictionary, accessed 10 July 2010.
- "Maltese Catacomb Complexes". UNESCO World Heritage Centre. Retrieved 2008-04-17.
- "Romania Libera:Network of tunnels under the capital city". Retrieved 2008-10-23.
- ScienceDaily, Bacteria Cause Old Buildings To Feel Off-Color 28 October 2008
- ScienceDaily, New Life Found In Ancient Tombs, 1 October 2008
|Wikimedia Commons has media related to: Catacombs|
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