cave, cavern, hollow, den, grotto, recess, niche, alcove, lair, shelter, refuge, hideaway, retreat, sanctuary, cranny, nook, pit, hole, depression, underground chamber, natural cave, rock shelter, gro... [more]
cave, cavern, hollow, den, grotto, recess, niche, alcove, lair, shelter, refuge, hideaway, retreat, sanctuary, cranny, nook, pit, hole, depression, underground chamber, natural cave, rock shelter, gro... [more]