Continuing excavations of Machu Picchu have revealed many secrets of the Incan Empire's prosperity; explores the secrets of how and why the Incans built the city on a steep Andean mountain ridge.

Unwrap the story of Egypt's Scorpion King, the man now believed to be the founder of Dynasty Zero, which brought the ancient empire together.

From the sword in the stone, the Round Table and Excalibur, to the lady in the lake, Camelot and the mystical island of Avalon, the story of King Arthur makes many claims about this figure; follow a team of experts as they debunk these tales.

Explore the science behind the April 2010 Icelandic volcanic eruption, which caused a 30,000-foot-high ash plume, major flooding, extensive evacuations and the biggest disruption in air travel since 9/11.

At Six Flags Magic Mountain just north of Los Angeles, the world's longest, fastest and tallest flying roller coaster is under construction; seriously steep terrain, severe weather and a number of unexpected events make this an extreme ride for the crew.