Extras

Video thumbnail: Secrets of the Dead Speed, Submarines, and Espionage

Secrets of the Dead

Speed, Submarines, and Espionage

The German navy used speed in the form of chewing gum to stay awake for more than 48 hours

Speed, Submarines, and Espionage

Video thumbnail: Secrets of the Dead Preview | World War Speed

Secrets of the Dead

Preview | World War Speed

Follow historian James Holland as he unearths the truth about amphetamine use in World War

Preview | World War Speed

Video thumbnail: Secrets of the Dead Blitzkrieg on Speed

Secrets of the Dead

Blitzkrieg on Speed

Historian James Holland and his team attempt to walk 22 miles wearing full WWII regalia.

Blitzkrieg on Speed

Video thumbnail: Secrets of the Dead Preview | Egypt's Darkest Hour

Secrets of the Dead

Preview | Egypt's Darkest Hour

Follow archaeologists examining a rare mass grave from the collapse of ancient Egypt.

Preview | Egypt's Darkest Hour

Video thumbnail: Secrets of the Dead Sacred Crocodile Mummies Reveal the Climate of Ancient Egypt

Secrets of the Dead

Sacred Crocodile Mummies Reveal the Climate of Ancient Egypt

Salima Ikram travels to Kom Ombo temple where ancient Egyptians worshipped crocodile gods.

Sacred Crocodile Mummies Reveal the Climate of Ancient Egypt

Video thumbnail: Secrets of the Dead Preview | King Arthur's Lost Kingdom

Secrets of the Dead

Preview | King Arthur's Lost Kingdom

Uncover new evidence suggesting the legend of King Arthur began in a Dark Ages trading vil

Preview | King Arthur's Lost Kingdom

Video thumbnail: Secrets of the Dead Archaeologists Discover a Look into the Dark Ages

Secrets of the Dead

Archaeologists Discover a Look into the Dark Ages

Archaeologists unearth a stone containing an inscription in Roman Latin and local dialect

Archaeologists Discover a Look into the Dark Ages

Video thumbnail: Secrets of the Dead The Origin of King Arthur

Secrets of the Dead

The Origin of King Arthur

Professor Roberts and manuscript curator Julian Harrison discover the beginning of Arthur.

The Origin of King Arthur

Video thumbnail: Secrets of the Dead Training Hannibal's Military Horses

Secrets of the Dead

Training Hannibal's Military Horses

Uncover the mystery of how Hannibal crossed the near-impregnable Alps to attack Rome.

Training Hannibal's Military Horses

Video thumbnail: Secrets of the Dead An Attack in the Gorge

Secrets of the Dead

An Attack in the Gorge

Uncover the mystery of how Hannibal crossed the near-impregnable Alps to attack Rome.

An Attack in the Gorge

Video thumbnail: Secrets of the Dead Hannibal in the Alps Preview

Secrets of the Dead

Hannibal in the Alps Preview

Secrets of the Dead: Hannibal in the Alps Premiered Tuesday, April 10 at 8-9 p.m. on PBS

Hannibal in the Alps Preview

Video thumbnail: Secrets of the Dead A Peek at the New Discoveries Inside the Great Pyramid

Secrets of the Dead

A Peek at the New Discoveries Inside the Great Pyramid

The team uses AR technology to see what the voids inside the Great Pyramid might look like

A Peek at the New Discoveries Inside the Great Pyramid

Video thumbnail: Secrets of the Dead Scanning the Pyramids

Secrets of the Dead

Scanning the Pyramids

Solve a 4,500-year-old mystery with Secrets of the Dead, Scanning the Pyramids.

Scanning the Pyramids

Video thumbnail: Secrets of the Dead Muography Helps Scientists See Inside the Great Pyramid

Secrets of the Dead

Muography Helps Scientists See Inside the Great Pyramid

Scientists use muography to create an internal scan of the Great Pyramid.

Muography Helps Scientists See Inside the Great Pyramid

Video thumbnail: Secrets of the Dead Scanning the Pyramids

Secrets of the Dead

Scanning the Pyramids

Technology discovers new secrets inside the Great Pyramid at Giza.

Scanning the Pyramids