Story

Electrical linemen repair 345,000-volt power lines from helicopters as part of America's nearly two-century hardwiring story; fiber optic cables transmitting light since the late 1970s remain vital infrastructure alongside wireless technology.

Mankind controls the environment in a variety of ways, whether by capturing the force of a river, harnessing the power in coal or oil, controlling a nuclear reaction, or transforming the light of the sun into electricity.

The intense competition, the romance, the success and disappointment that led to the miracle of long distance communication.

The ability to transmit sound in stereo transformed the music of life into a rich symphony of sound; for over 100 years, enthusiasts and scientists have worked to create the ideal listening experience; we examine this multi-billion dollar business.

Satellites and the global positioning system spark a revolution in cartography.

An investigation into the true fate of the Knights Templar begins in Jerusalem, where tunnels and a safe house may have been used to move holy relics to safety during the fall of the city.

In Acre, Israel, the team goes underground to investigate the purpose of the Templars' tunnel system, theorizing they may have contemplated a covert landing in sea caves.

Part 3/4. Armed with insight into two centuries of Templar survival strategies and battle tactics, the team turns their attention to the Templars moment of reckoning: the fall of the order in 1307; they find evidence of a Templar smuggling operation.

Part 4/4. Seven years after the alleged end of the Templars, signs the knights were rising again appear in Portugal.

Author Dan Brown puts forth astonishing hypotheses in one of his novels that try to link a mystery to the life of Jesus.

The city the Knights Templar knew as Tortosa now lies among modern homes in the Syrian city of Tartus.

The Knights Templar were a powerful legion of sword-wielding monks who terrified the Muslims during the Crusades.

An investigation into the true fate of the Knights Templar begins in Jerusalem, where tunnels and a safe house may have been used to move holy relics to safety during the fall of the city.

In Acre, Israel, the team goes underground to investigate the purpose of the Templars' tunnel system, theorizing they may have contemplated a covert landing in sea caves.

Part 3/4. Armed with insight into two centuries of Templar survival strategies and battle tactics, the team turns their attention to the Templars moment of reckoning: the fall of the order in 1307; they find evidence of a Templar smuggling operation.

Part 4/4. Seven years after the alleged end of the Templars, signs the knights were rising again appear in Portugal.

Author Dan Brown puts forth astonishing hypotheses in one of his novels that try to link a mystery to the life of Jesus.

The city the Knights Templar knew as Tortosa now lies among modern homes in the Syrian city of Tartus.

The Knights Templar were a powerful legion of sword-wielding monks who terrified the Muslims during the Crusades.

An investigation into the true fate of the Knights Templar begins in Jerusalem, where tunnels and a safe house may have been used to move holy relics to safety during the fall of the city.