Secrets of the Superfactories
From Siberia to India, the Andes to the Arctic, and from deathtraps and vital lifelines to playgrounds for thrill-seekers, this episode explores the planet's extreme roadways
The 10 most extreme bridges on Earth: from Nepal and Japan to Bolivia and Russia, bridges that demonstrate extreme engineering and stand in unforgettable locations
From awesome engineering to extreme environments and thrill-seeking train-surfers and from the high-tech to the home-made, these are the 10 most extreme railways on Earth
Exploring the world's most dangerous and inspirational waterways, from white water rafters taking on undefeated rapids on the Congo River to Antarctic waters' frozen fist
This episode visits the 10 most extreme airports on Earth, including an ice airport that's rebuilt each year, a runway squeezed between skyscrapers and a landing strip carved into mountains
From the Swiss Alps to a Japanese metropolis, tunnels are often wonders of modern construction, but can also be scenes of disaster. These are the 10 most extreme tunnels on Earth.