A $2.3 million restoration is using advanced laser technology to clean and preserve the 1,840-year-old Rome’s Column of Marcus Aurelius.

Deep beneath the desert plateau of Saqqara, a row of colossal stone boxes has become a lightning rod for anyone convinced that ancient Egypt once wielded a level of technology we no longer understand.

Recent research has speculated that the Step Pyramid of Djoser in Egypt was built using water-powered engineering rather than using ramps, levers and human labour as experts have suggested before. The ...