World's Most Extreme

We all have to get from A to B, but some journeys are more extreme than others. Forty million miles of roads circle our globe. For thousands of years they have connected communities and broadened horizons. Across the planet, from Bolivia to India, the Himalayas to the Arctic, roads are vital lifelines, playgrounds for thrill-seekers, and terrifying death-traps.

Our extreme bridges span the world. From Nepal and Japan to Bolivia and Russia, we see engineering in the extreme. These are bridges that defy gravity and the elements. We see the tallest bridge ever built and bridge projects which bring communities together. These astonishing structures bring us unique jobs, incredible stories, and some terrifying near-disasters.

From India to Japan, Peru to the Philippines, railroads mean awesome engineering in extreme environments. From high-tech to home-made, the highest to the fastest, we get on board, in the driver's cab, and even on the roof, to bring you the 10 most extreme railroads on earth.

From mammoth canals to ferocious seas, the world's waterways are vital to life on Earth as we know it. An arena for trailblazers, criminals and adrenaline junkies, our ten extreme waterways put lives at risk and inspire astonishing missions and marvels of engineering.

These are the top 10 most extreme airports on the planet, connecting the world from Hong Kong to Alaska, Nepal to the South Pole. An Ice airport rebuilt every year, runways squeezed between skyscrapers and carved into mountains, vital lifelines and launch pads for thrill-seekers.

Tunnels are dark and menacing, deep underground and far from help. From the Swiss Alps to a Japanese metropolis, tunnels can be wonders of modern construction, refuges in a crisis, and scenes of disaster. These are the ten most extreme tunnels on Earth.