artifact – n. a simple object made by people in the past

cave – n. a large hole that was formed by natural processes in the side of a cliff or hill or under the ground

incredible – adj. very good or exciting

incense – n. a substance that burns with a strong, sweet smell, often used in religious ceremonies

crawl – v. to move on your hands and knees

sinkhole – n. a hole in the ground, especially in an area of limestone rock, that has been formed naturally