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Nature

Yosemite | Official Trailer

Aired: 2017-03-29 04:00:00 0:35 Rating: NR

As climates change and temperatures rise, Yosemite Valley is a wilderness at risk.

NATURE: Yosemite @ 8/7c

Yosemite is a land forged in wildfire and sculpted by water, but with climate change, water is scarcer and fire more common. Join scientists and adventurers to investigate how these global changes are affecting one of America’s greatest wildernesses.

NOVA: Secrets of the Viking Sword @ 9/8c  

The Vikings were among the fiercest warriors of all time. Yet only a select few carried the ultimate weapon of their era: the feared Ulfberht sword. Fashioned using a process that would remain unknown to the Vikings’ rivals for centuries, the Ulfberht was a revolutionary high-tech tool as well as a work of art. Considered one of the greatest swords ever made, it remains a fearsome weapon more than a millennium after it last saw battle. But how did Viking sword makers design and build the Ulfberht, and what was its role in history?

Secrets of the Dead: Nero's Sunken City @ 10/9c

Baiae… An escape for ancient Rome’s powerful elite, the Las Vegas of its day. Now, archaeologists are mapping underwater ruins and piecing together what life was like in this playground for the rich.

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