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Examining the advances in engineering that made some of the world's most iconic structures possible. In a landmark CGI-driven series, BIG, BIGGER, BIGGEST reveals the inventions that enabled structures to grow in size and scale.

Look at engineering leaps that have helped different types of structures go from big to bigger to biggest.

Before man ruled the world, Earth was a land of giants. Count down the biggest beasts of their kind to ever roam the planet in this eye-opening special, and uncover the secret lives of these supersized species. Birds with plane-length wingspans, dinosaurs rivalling a Boeing 737; this stunning CGI special goes in search of the truth behind these monsters, counting down the ten largest and most extraordinary finds. From handling the recently unearthed bones of a dinosaur far larger than previously known, to analysing the flight technique of a giant seven-metre bird uncover the unique adaptations that allowed each animal to thrive.

Whether it's a romantic getaway to the breathtaking canyons of Mars or the ultimate vacation in Jupiter's magnetic field, National Geographic Channel brings you the ultimate in adventure travel, but it is not for the faint-hearted. Today's super space traveller must endure drastic climates that shift from 450 degrees celsius in the sun to minus 170 celsius in the shade, crushing gravity, acid smog, and blistering radiation. From Jupiter's churning red eye to Saturn's glittering rings, the sights are out of this world. Blast-off with A Traveller's Guide to The Planets, the ultimate travel guide to the Solar System.

At the end of World War II, Adolf Hitler faced the reality of defeat and committed suicide. Then his body mysteriously disappeared. The FBI spent years tracking false leads and sightings of Hitler. What happened to the German leader's remains?

1943 – Germany and Russia clash near the Soviet city of Kursk, as each vies for control of the Eastern Front. The Germans are led by Field Marshal Erich von Manstein – an aristocratic master tactician. Facing him is the Red Army’s Marshal Zhukov – ruthless, opinionated and dangerous to know. Hitler is convinced new super-weapons like the Tiger tank will win the fight and insists von Manstein hold off his attack until more arrive. Zhukov exploits the delay and orders his men to dig for victory. They create an elaborate network of defences to grind the enemy down – or blow them up… The two armies finally meet in a titanic clash of tanks - the biggest tank battle of all time - which will change the course of the war.

The Alien Deep. It's a place in the sea, thousands of feet beneath the surface, far from the first crack of light, where the planet's last and greatest secrets hide in the cold darkness of endless night. With cutting edge tools and amazing new camera technologies, National Geographic embarks on a first-ever voyage of deep ocean exploration – thousands of feet beneath the waves – to a hidden world of new ecosystems, new species, and new wonders never seen before.

A Window into the Volatile Paradox of Islam's Most Sacred Text. The Koran is one of the most ideologically influential texts in the world, with over a billion Muslims following its precepts. Yet within this singular religious community there are profound differences in attitudes about peace, violence, punishment, forgiveness and the status of women, among others.