Barney and Gemma meet the sports stars of the sea - sprinters, jumpers and even gymnasts!
Barney and Gemma show that coral reefs are like our cities - and everyone has a job to do.
Nothing says Australia quite like the outback, but what exactly is it, where does it even start, and why does it continue to capture our imagination?
Albert Lin travels to Colombia, South America, to find out the truth behind the legends of El Dorado.
This historic railway is the stuff fairy tales are made of, complete with a vintage steam train making its way through picturesque German villages, and ancient forests of the Harz mountains. But its past is scarred with haunting secrets. It holds tales of witches, human suffering, and a top-secret Nazi weapons program.