Tom Metcalfe

Built in the third century B.C., the towering structure was among the seven wonders of the ancient world.

The famous Roman writer was also a military commander who sailed across the Bay of Naples during the disaster.

Did human ancestors use fire to cook their meat? Some argue it served another, more valuable purpose.

The dramatic interlocking stone walls at Machu Picchu have proven to be highly earthquake-resistant.

Knowledge of how to make the bright purple dye was a valuable trade secret to the Phoenicians.