National Geographic Channels International

An investigation into the mysterious people who built Machu Picchu, the 15th-century Inca citadel located in southern Peru.

Abel Pintos explores the legacy and great influence of Mercedes Sosa, the woman who revolutionized Argentine folklore. Thus, through interviews with musicians and intellectuals who supported her at the beginning of her career, with her grandchildren who knew her most intimate side, and with artists such as Fito Páez and Charly García, Abel reconstructs and honors the Mercedes figure.

By way of unearthed material, commentary from Andrés Calamaro’s friends and former bandmates, and an in-depth interview with Calamaro himself, this special explores the multi-instrumentalist, Latin Grammy award-winning artist’s career.

For two-thirds of the year, the Little Rann is a desert. Suddenly, in August, monsoon winds whip up the Arabian Sea and carry it 100 km inland. The desert and these mounds soon become islands and homes to high concentrations of rarely-seen, endangered and spectacular wildlife.

Hosted by Chilean singer Javiera Mena, the episode reviews the career of the former Soda Stereo frontman.

Considered Mexico’s greatest footballer of all time, Hugo Sánchez sits down with Adrián Uribe to discuss the chapters of his life both from both on and off the pitch. Sánchez looks back at his career that began in Mexico and saw him reach the pinnacle of Spanish football, and also opens up about the death of his son, Hugo Jr.

They say it's over 2000 years old, and more than 4,000 miles long. But even today nobody really knows for sure. The Great Wall of China is one of the world's famous buildings but it is still the least known. British writer and historian William Lindesay has lived in China for twenty years. Exploring the Great Wall has become his lifetime obsession.

The two-hour episode proposes a revealing journey into intimacy and the rediscovery of this figure who marked the music scene with his art. The production has the collaboration of his family, in front of and behind the camera, more than one hundred hours of unpublished material, testimonies and exclusive access to recordings rarely seen.

This is a journey through the trajectory of the Colombian duo Aterciopelados by the hand of the singer Li Saumet. With exclusive interviews to them and their inner circle, as well as access to unpublished material, this documentary illuminates unknown details and reveals for the first time why they were separated for three years, the deep personal changes they experienced and the relationship that unites them.

The incredible story behind the multi-million dollar moon rock heist at NASA - and how it was an inside job. In July 2002 'physics genius' Thad Roberts and three accomplices pulled off perhaps the greatest ever theft in NASA history at the Johnson Space Centre, Houston, Texas. Using their NASA IDs Roberts, and one female partner in crime, slipped into the centre at night stealing a 600lb safe containing moon rocks from every Apollo mission.

Oceanographers have been gripped by a new spirit of discovery and have undertaken the biggest population census of ocean species ever conducted - a "Census of Marine Life". The quest: to find out when and where it all began. Where did the water come from? How was life created in the oceans? And how did it evolve to the enormous diversity we see today? Join National Geographic as we travel more than 4 billion years into the past to uncover how oceans and marine life came to exist.

Mexican journalist Arturo Hernández learns about the routine of iconic rocker Alex Lora and that of his band, El Tri, by visiting the dive bars and venues that hold the secret to their success. Also, Arturo visits Alex at his home, where he witnesses firsthand the profound bond between Alex and his wife/manager, Chela Lora.

The Soviet Union was a sinister world. Now the Iron Curtain has fallen, and for the first time we can investigate those rumours.

For centuries, people have reported sightings of a strange creature lurking within the gloomy waters of Scotland's infamous Loch, but are these accounts true or are they just another myth or giant hoax? Despite years of investigation and countless eyewitness testimonies, the riddle of this legendary brute has continued. Now, dive into the depths of this controversy using a mix of science, eye witness testimony, zoology, and psychological testing.

On the Great Plains below Mount Kilimanjaro in Kenya, lions are attacking Maasai cattle, as they have for hundreds of years. And the proud Maasai warriors have hunted them ruthlessly in return so that now only about 2,000 remain in the country. If their numbers drop any lower, their populations will not be sustainable. Now the Maasai elders and chiefs are recognizing that the threat to their lions is also a threat to their way of life, and have forbidden the warriors from hunting them. Wildlife filmmaker Kire Godal, with the support of executive producers Dereck and Beverly Joubert, captures firsthand the struggle of these modern-day warriors who are reinventing their traditions to help save the lions they once prided themselves on killing.

On the 57th anniversary of Martin Luther King Jr.'s "I Have a Dream" speech, activists joined at the Lincoln Memorial for the 2020 March on Washington event.

South Florida is the only place on Earth that is home to both the American alligator and the American crocodile (and most recently, the Nile crocodile). But who is the baddest Florida predator?

The grandest ocean liner ever built, its final resting place remained a mystery. Just how was the wreck's discovery linked to the Cold War's darkest days?

Enjoy some of the bizarre and unbelievable creatures unique to Australia's shores as investigators and scientists probe the secrets of this infinitely varied wildlife.