On location: The Americas
Photos of Iain's time in The Americas
Salar de Uyuni
A vast salt flat where a lake has been uplifted thousands of metres above sea level.
Lithium salt crystals, Salar de Uyuni
Used in mobile phones, these crystals may be a new source of mineral wealth for Bolivia.
Cerro Rico, Bolivia
Cerro Rico is one of the most dangerous mines in human history.
The most typically Andean animal, the llama.
The Grand Canyon - a portal through time
The rocks at the bottom of the Grand Canyon are 1.7 billion years old.
Iain Stewart up close and personal with an American Alligator.