Artificial cave is a term used to describe a man-made structure that resembles a natural cave. There are many synonyms for this term, each describing a specific type of structure or design. Some of these synonyms include underground bunker, subterranean hideout, artificial grotto, man-made cavern, simulated cave and constructed catacomb. These terms vary in their connotation and usage, but all imply a structure built to mimic the appearance of a natural cave. From secret military installations to backyard retreats, artificial caves have a variety of uses and can be found all over the world, often serving as a testament to human ingenuity and creativity.