History’s Biggest Mysteries History’s Biggest Mysteries The origins and meanings of some of the world’s most baffling historic places and events are the stuff of legend. Some involve theories about sorcery, alien encounters and unexplained structures. Stonehenge This huge stone monument in the English countrysidehas been puzzling people for centuries. There are working theories about why it’s circular and what it was used for. The Great Sphinx of Giza The 240-foot-long limestone statue of this mythological figure overlooks the bank of the Nile (here), but exactly when it was built and why has been up for debate. Also, where’s its nose? Lost Colony of Roanoke A group of 16th-century British settlers and their dwellings are said to have completely vanished from their early Virginia colony Easter Island Eighteenth-century Dutch explorers stumbled upon this remote South Pacific island and were stunned by the hundreds of huge stone statutes erected there .Natives died off — here’s one cause...