BBC Earth

What draws humans to the coldest and most hostile reaches of our planet?

The last leg of Joanna Lumley's journey takes her by dhow to Zanzibar, the spice island of Africa where merchants from around the world have left their mark on the architecture, religion and music.

Returning to Nepal, the film crew use thermal cameras and drones to follow tigers after dark, revealing a hidden world of previously unseen behaviour and surprise encounters.

Enjoy the view from a century-old water tower as it is transformed into a unique home, then take flight on a repurposing journey that will rocket the UK space program to prominence.

Alongside Cuban fishermen Robson searches for sardines, tarpons, bonefish, barracudas and grouper fish.

Griff Rhys Jones' journey across NZ using only the back roads sees him travel from Queenstown, over The Remarkables, and finish his trip at the very tip of the country, Bluff.

The last leg of Joanna Lumley's journey takes her by dhow to Zanzibar, the spice island of Africa where merchants from around the world have left their mark on the architecture, religion and music.

Robson fishes for some of Japan's famous fish, including the famously poisonous Fugu and other exotic catches.

Simon Reeve voyages across Mexico's beautiful and remote Sea of Cortez, known as the 'aquarium of the world,' to dive with rare and dangerous sharks.

Lucy must adapt to life as a hunter-gatherer and earn the respect of the tribesmen, whose knowledge, skills and understanding of the land will be vital for the expedition ahead.

In Germany, floods tear through central European towns and villages. In Nepal a landslide threatens local communities. In California, wildfires tear through the states forests and farms.

Robson fishes for some of Japan's famous fish, including the famously poisonous Fugu and other exotic catches.

Simon Reeve voyages across Mexico's beautiful and remote Sea of Cortez, known as the 'aquarium of the world,' to dive with rare and dangerous sharks.

In Germany, floods tear through central European towns and villages. In Nepal a landslide threatens local communities. In California, wildfires tear through the states forests and farms.

Simon Reeve voyages across Mexico's beautiful and remote Sea of Cortez, known as the 'aquarium of the world,' to dive with rare and dangerous sharks.

Lucy must adapt to life as a hunter-gatherer and earn the respect of the tribesmen, whose knowledge, skills and understanding of the land will be vital for the expedition ahead.

In Germany, floods tear through central European towns and villages. In Nepal a landslide threatens local communities. In California, wildfires tear through the states forests and farms.

Guangdong's coastline is the longest in China and is shelter to all manner of extraordinary marine life; Corals, Green Turtles, Bowed fiddler crabs, and the Black-faced spoonbill.

Simon Reeve voyages across Mexico's beautiful and remote Sea of Cortez, known as the 'aquarium of the world,' to dive with rare and dangerous sharks.