In a groundbreaking expedition on Mount Everest, dozens of scientists converge to investigate what secrets the world’s highest peak has to tell us about our changing climate. The notorious Khumbu Glacier is mapped in stunning detail, biologists study extreme lifeforms, and a team of Sherpas and climate scientists climb straight toward the “death zone” to install the highest weather station in the world.

Outside the Sudanese capital Khartoum, the remains of an ancient city stand in the desert. Are you ready to dive beneath the pyramids of Sudan's black pharaohs?

In the heart of Uganda, there are lion prides that spend much of their lives in the trees – a rare and mysterious behavior seen in few other places in Africa – and little is known about why they do it. Big cat biologist Alexander Braczkowski sets out to study these lions, and his journey takes an unexpected, emotional turn.