World's Most Extreme (2014 - 2018)

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. Check out some of the most dangerous, eye-popping and extreme bridges from across the globe.

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. From mammoth canals to ferocious seas, the world's waterways are vital to life on Earth. They are also arenas for trailblazers, criminals and adrenaline junkies. These 10 extreme waterways are dangerous, relentless and shocking.

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 mountain.

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.