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. Across the world roads are vital lifelines. Witness mountains blasted to keep roads open, the worlds worst traffic, and a one-lane road with a 1900 foot drop, known as Death Road. These are the 10 most extreme roads in the world.

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.

A look at 10 of the world's most remarkable buildings, including a skyscraper in earthquake-prone Mexico City, the world's biggest building and, in Norway, the world's tallest timber building.

An exploration of nature's deadly forces, from huge underwater canyons that funnel massive waves, to a bridge built from living trees, and Europe's little-known supervolcano, which could kill millions.

This episode examines how humans can thrive in harsh locations, from the world's highest town to a desert town in California with no rules, and an upside-down town in the Australian outback.

This high-octane episode reveals the most incredible vehicles from across the globe, from a bulletproof storm-chaser to the world's biggest terrestrial vehicle, which weighs in at 14,200 tonnes.

This episode checks out incredible flying. Daredevil Scotty Bob dons a wingsuit and flies inches from sheer rock. Plus: helicopter herding, solar planes, space delivery services and more.

This episode showcases marvels of marine engineering, from the part-plane, part-boat Airfish to the world's largest vessel. And Australian David Warby attempts to break the world water speed record.