Examples from literature

• Four avenues opened out of the small cavern which the great rock stood in. 
• I continued my way further into the cavern, watching the play of light upon the huge stalactites that hung from the roof. 
• The cavern was as big as two or three rooms bunched together, and Jim could stand up straight in it. 
• The cavern was imperfectly explored. 
• You shall go with me into the dark caverns of the earth, and see how rocks and metals are made in nature's forging shop.