BBC Earth

Reza is in Saudi Arabia to reveal the secrets of a hidden frontier on the brink of historic change.

Lindsey Vonn joins Bear on the French island of Corsica, where they rappel down a rock wall, use a spear gun, swim and dine on sea urchins.

From space, Earth's surface is covered in wonderful shapes. Wombats dig burrows across the Australian outback and elephants in in the Congo clear an opening in the forest.

The Simien Mountains is an exotic and dramatic landscape set in the northern corner of Ethiopia. Breath-taking views abound in this natural landscape inhabited by unique and endangered wildlife.

Reza is in Saudi Arabia to reveal the secrets of a hidden frontier on the brink of historic change.

Michael Palin explores Caracas's stark wealth divide and political crisis before heading to the Amazon to see Angel Falls and uncover the impact of illegal gold mining.

Feel the burn at a state-of-the-art gym that used to be a psychiatric hospital and in a climbing complex that once was a sugar refinery.