Stonehenge is the ancient world's greatest wonder and biggest mystery. Now new discoveries are revealing its deepest and darkest secrets, showing how ancient magic, bizarre rituals, and brutal murder built this strange monument.

The lost city of Machu Picchu is one of the greatest mysteries in archaeology. Scientists do not know why this city in the clouds was built, but investigations into secret Inca codes and deformed skeletons might finally reveal its ultimate mystery.