Host Don Wildman explores ancient structures buried beneath the desert sands of Egypt and the streets of Cairo, examines how these engineering marvels survived invasions, and discovers a tomb filled with 2,000-year-old mummies. Also examined: the Book of the Dead and a step pyramid built a century before the Giza pyramids.

Host Don Wildman explores underground Sydney, including a 19th-century prison, caves that were once home to fugitive outlaws, and gold mines. Also, a secret World War II storage place for chemical weapons is toured by those who once worked there.