From Russia to Iran: Crossing Wild Frontier - Season 1

Actor Zac Efron journeys around the world with wellness expert Darin Olien in a travel show that explores healthy, sustainable ways to live.

Award-winning actor and nervous explorer Eugene Levy steps out of his comfort zone for a whirlwind tour of the world's most beautiful and intriguing destinations.

Michael Palin attempts to copy the exploits of fictional character Phileas Fogg, by trying to travel around the world (without flying) in 80 days.

Morgan Freeman presents his quest in order to find how most religions perceive life after death, what different civilizations thought about the act of creation and other big questions that mankind has continuously asked.

Bear strands himself in popular wilderness destinations where tourists often find themselves lost or in danger.

Inspired by his late mentor, Will Smith spends 100 days facing extreme challenges, venturing from pole to pole with scientists, explorers and experts.

Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.

Australian host Steve Irwin and his wife Terri run a wildlife refuge. Their shared passion is educating the world about wildlife, including the much feared crocodile and numerous venomous snakes. Steve's specialty is the capture and relocation of crocodiles. No animal appears too threatening to Steve, his true respect for animals is the foundation for everything he does.

PBS' premier science series helps viewers of all ages explore the science behind the headlines. Along the way, NOVA demystifies science and technology, and highlights the people involved in scientific pursuits.

Natural World is a nature documentary television series broadcast annually on BBC Two and regarded by the BBC as its flagship natural history brand. It is currently the longest-running series in its genre on British television, with more than 400 episodes broadcast since its inception in 1983. Natural World is produced by the BBC Natural History Unit in Bristol, but individual programmes can be in-house productions, collaborative productions with other broadcasters or films made and distributed by independent production companies and purchased by the BBC. Natural World programmes are often broadcast as PBS Nature episodes in the USA. Since 2008, most Natural World programmes have been shot and broadcast in high definition.