These ancient structures still stand - but the people who built them remain a mystery that history can’t fully explain.

A huge bar of iron has been discovered lurking inside the iconic Ring Nebula. The structure is enormous, spanning hundreds of ...

Egypt’s Great Pyramid of Giza may be one of the most iconic landmarks on the planet but, beneath its surrounding sands, there ...

In a recent revelation that could reshape our understanding of space and the potential for extraterrestrial life, NASA has released data suggesting the presence of artificial structures on the moon.

During the season eight premiere episode of "The UnXplained" host William Shatner takes viewers all over the world to examine ancient structures.