The world's most incredible trains cross deadly canyons and chasms of terrifying heights, and were made possible by expert engineering and cutting-edge technology.

The world's most incredible trains have conquered dangerous oceans and seas, and were made possible by expert engineering and cutting-edge technology.

***This episode is a duplicate of S09E03, which is the correct episode number on IMDB and TVDB*** A look at the incredible machines built to get troops directly to the front line, on land, at sea and in the air.

***This episode is a duplicate of S08E03, which is the correct episode number on IMDB and TVDB*** The Independent, a residential skyscraper in Austin, Texas. At 690ft, it is the tallest building in the city, surpassing the 683ft Austonian, another residential skyscraper.

***This episode is a duplicate of S08E01, which is the correct episode number on IMDB and TVDB*** A look at the world's biggest oil tanker - the mighty Supertanker Europe of the record-breaking TI Class of ship.

***This episode is a duplicate of S07E07, which is the correct episode number on IMDB and TVDB*** A look at the Beijing Daxing, set to become the biggest airport in the world, designed to accommodate a staggering 100 million travellers each year.

***This episode is a duplicate of S07E04, which is the correct episode number on IMDB and TVDB*** The skinniest skyscraper on earth is being built in New York City. Can engineers find a way to build this ultra-tall slender building?

***This episode is a duplicate of S09E04, which is the correct episode number on IMDB and TVDB*** The Falkirk wheel is the first and only rotating boat lift, capable of moving 600 tonnes of boat and water over a 25-metre height difference in just minutes.

***This episode is a duplicate of S09E01, which is the correct episode number on IMDB and TVDB*** Stratolaunch is designed to lift rockets, spacecraft and experimental high-speed hypersonic planes into the stratosphere, then release them for their onward journey into space.

The HMS Queen Elizabeth aircraft carrier has a surface area larger than two soccer fields, and is stocked with cutting edge F35 fighter jets. Discover how this megaship ticks inside and out.

The Tesla car factory is one of the largest and most innovative factories in the world. This state-of-the-art facility is the home to high-tech robots that work around-the-clock to produce thousands of cutting-edge electric cars each week.

Explore three battlefield behemoths that command land, sea and air.

Go inside the largest cruise ship on the planet: MS Harmony of the Seas. A massive ship that's 1,181 feet long and a staggering 227,000 tons.

The Shard, a 73-story glass skyscraper in London, has 11,000 exterior glass panels, a colossal concrete core that supports luxury apartments, a hotel, and close to 600,000 square feet of office space.

A state-of-the-art NATO airplane is one of the most complex surveillance tools in the world. Special access inside the behemoth reveals how cutting-edge engineering and a hi-tech midair refueling system helps its crew defend against security threats.

The Independent, a brand-new skyscraper in Texas is a gravity-defying engineering marvel with a one-of-a-kind shape, and to build it, experts use cutting-edge construction and design that pushes modern-day tower-building to strange and innovative heights.

Engineers in China are constructing the largest and most ambitious water transfer project in human history, defying nature to move vast quantities of water from the south to the dry north in Beijing, all without the use of pumping stations.

The US military's most advanced hovercraft is a new feat of engineering.

Soaring over 2,000 feet into the sky, the Shanghai Tower is the second tallest building in the world, and a futuristic engineering marvel. Discovery how cutting-edge technology means that the building's occupants will never feel it sway.

China's Three Gorges Dam is the largest and heaviest concrete structure on earth, and it produces more power than any hydroelectric dam ever built. Discover how engineers reshaped a river to accomplish this incredible engineering feat.

The Virginia Class is one of the most advanced nuclear powered, fast attack submarines ever produced for the US Navy. These technological titans are almost 400 feet long, and weigh a staggering 7,800 tons.

The US Navy's brand-new Ford-class aircraft carrier is the world's largest warship, and using the latest naval and aeronautic technology, engineers and military personnel race to build and test this cutting-edge vessel.

The Shanghai Maglev is the fastest passenger train in operation on the planet. Discover how engineers were able to design a train that could levitate, and reach a phenomenal top speed of 268 mph.

An ambitious team of engineers has created an Iron Man-like jet suit that can propel the user over 30 miles per hour, and using cutting-edge technology, these visionaries have made dreams of the distant future a reality.

The Black Pearl is one of the largest and fastest sailing yachts in the world, and using cutting-edge innovations in shipbuilding and engineering, its crew puts this brand-new $200 million vessel through the gauntlet to test its unique capabilities.