National Geographic HD (Pacific)

Evidence of man-made reservoirs and toxic contaminants, and clues of battles and monumental pressure paint a picture of the Maya's downfall.

While the arrival of the Spaniards in the 16th century triggered a series of wars that caused the abandonment of the great Mayan cities, there is evidence that the Mayans never disappeared and their civilization never fell.

An attack on a small religious community on the holy island of Lindisfarne in A.D. 793 heralded the start of the Viking age of conquest and expansion; the Vikings' beginnings in Scandinavia.

The Siege of York occurred from 866 when the Great Heathen army laid claim to the Northumbrian capital of York; looking at the major battles, players and strongholds in ninth-century England.

The Silk Road opened up a world of trade for the Scandinavians in the East; seeking further wealth, the Vikings known in the East as "the Rus" attacked Constantinople in 860.

The siege of Paris in 885 was the culmination of the Viking invasions of Francia; looking at the persistent Viking attacks on Francia and the enduring presence of the Scandinavians on the Frankish Empire and beyond.

Political turmoil in Norway leads a voyage of discovery west. The Vikings discover Iceland where they established lasting settlement. Further exploration from Iceland leads to the discovery of Greenland and to the shores of Newfoundland, making them the first Europeans to discover America.

The mid-10th-century reign of Harald Bluetooth as king of a newly unified, powerful and Christianized Denmark marked the beginning of a second Viking age. But the reign was not to last with the Normans finally winning the English Kingdom in 1066. We look at the final days of the Viking empire.

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The story of the largest financial fraud in history as told by those who were there, including victims, employees, family members, FBI agents, and Bernie Madoff himself; includes archival news footage, photos and recordings.

The inside story of how DEA agents and the Colombian National Police brought down drug lord Pablo Escobar, the most vicious drug cartel in the world.

Seeing Saddam Hussein through the eyes of people who survived his terror and experienced his love.

Tracing the billion-dollar rise and fall of rap mogul and accused murderer Suge Knight.

Exploring one of the greatest immigrant success stories of our time.

Following the tale of Pablo Escobar's cocaine empire, built on bribes, bodies and trust.

The story of Russian leader Vladimir Putin, told by those who know him best.

HSI finds overcrowded human stash houses; CBP discovers meth in machinery.

Rookie CBP officers find multiple drugs; HSI runs a buy-bust operation.

A 48-hour sting leads HSI to a stash house; CBP finds drugs in gas tanks.

CBP Dulles finds outbound drugs; Border Patrol tracks human smugglers.

Border Patrol chases suspect fleeing arrest; CBP stops weed leaving the U.S.

HSI finds cocaine hidden in frozen avocado paste; CBP recovers stolen cars.