Mega Structures Roller Coaster

Castro was a law student at the University of Havana before getting involved in politics and gang violence.

Brady heads into the bush and measures each animals' power, and witnesses firsthand the differences in their methods of attack.

The Russian Arctic, extreme habitat and haven for polar bears, lemmings, arctic foxes and walruses.

Exploring our own planet for clues as to what extraterrestrial life might look like, what if we do make contact?

Combine Harvesters are masters of engineering but how are they built? A look inside the John Deere Factory.