Catacomb
Source: ontheluce.com
Meaning: 1. An underground tunnel with recesses where bodies were buried (as in ancient Rome).
2. human-made subterranean passageways for religious practice.
Pronunciation: kat-uh-kohm
Synonyms: Chamber, cave, crypt, grotto, passageway
Usage/Example: 1. The Vatican reported on February 23 that an ambitious restoration project at the catacombs of Sts. Mercellinus and Peter has been completed. (Source: Catholic Culture-23-Feb-2016)
2. I find catacombs scary sometimes.
3. One of my favourite games is "The Riddle of Catacombs" which offers an adventure in some rare and exciting destinations