What is "cataphile"

n. 1 A type of urban explorer who visits the ancient catacombs and quarries linked by tunnels beneath Paris. 2 (context by extension English) Any individual who explores subterranean quarry, mines, or catacombs.

Cataphiles are urban explorers who illegally tour the Mines of Paris, a term popularly used to describe a series of underground tunnels that were built as a network of stone mines, which are no longer used. The Catacombs of Paris comprise a subset of this network.