Smithsonian Channel

A breathtaking journey down the German section of the beautiful Moselle river, famous for vineyards on its dramatically steep banks and remarkable meandering loops.

Part 1 of 2: Travel the length of the Nile, from Cairo to Aswan, as Tony explores tombs of every shape and size; find hidden treasures, hunt for a lost pyramid and find out what newly discovered mummies can tell about ancient Egyptian history.

The Pyramid of Khufu is the only one of the Seven Wonders of the Ancient World which can still be seen in its original state.

At the heart of Saqqara, the largest necropolis in Egypt, is the Step Pyramid of Djoser, built around 2600 BC.

Meidum is the least-known of the pyramids of Egypt as it stretches skywards to resemble a castle keep.

On the site of Dahshur, south of Cairo, are two revolutionary monuments which seem to be the first real pyramids.

The world has its focus on the Pyramid of Khufu in Egypt, but nearby on the Giza plateau, other architectural masterpieces stand the test of time.

Egyptologists believe there was a perfect pyramid, hidden in the sands of Abu Rawash, which served as a tomb for the pharaoh Djedefre.

Milwaukee commissions Calatrava to design a museum with 90-ton wings that take flight; Oslo tears down its national ski jump and rebuilds it for the World Championships; and in LA, a 235-foot tower is wrapped in steel bands.

At Cirque du Soleil in Las Vegas, Mike embeds with the talented teams that maintain the amazing machines behind Cirque du Soleil's stage shows.

Flying on one of the biggest helicopters on Earth, on a quest to pull valuable timber from the forest; huge repairs threaten to bring this mission to a halt.

Milwaukee commissions Calatrava to design a museum with 90-ton wings that take flight; Oslo tears down its national ski jump and rebuilds it for the World Championships; and in LA, a 235-foot tower is wrapped in steel bands.

At Cirque du Soleil in Las Vegas, Mike embeds with the talented teams that maintain the amazing machines behind Cirque du Soleil's stage shows.

Flying on one of the biggest helicopters on Earth, on a quest to pull valuable timber from the forest; huge repairs threaten to bring this mission to a halt.

Milwaukee commissions Calatrava to design a museum with 90-ton wings that take flight; Oslo tears down its national ski jump and rebuilds it for the World Championships; and in LA, a 235-foot tower is wrapped in steel bands.

At Cirque du Soleil in Las Vegas, Mike embeds with the talented teams that maintain the amazing machines behind Cirque du Soleil's stage shows.

Flying on one of the biggest helicopters on Earth, on a quest to pull valuable timber from the forest; huge repairs threaten to bring this mission to a halt.

Milwaukee commissions Calatrava to design a museum with 90-ton wings that take flight; Oslo tears down its national ski jump and rebuilds it for the World Championships; and in LA, a 235-foot tower is wrapped in steel bands.

New York's Hudson River stretches 315 miles through natural landscapes, from the Adirondack Mountains to the George Washington Bridge and Statue of Liberty.

Traipsing along ancient pathways crisscrossing Easter Island; finding gigantic designs carved into Asia's Eastern Steppe; ascending a tall pyramid rising from Antarctica's icy landscape.

Phil Risko's team at Northstar works fast to refloat a trawler that's been blown onto the shore of a national park in New Jersey; the team improvises to get it back to sea before it suffers further damage.

New York's Hudson River stretches 315 miles through natural landscapes, from the Adirondack Mountains to the George Washington Bridge and Statue of Liberty.

Traipsing along ancient pathways crisscrossing Easter Island; finding gigantic designs carved into Asia's Eastern Steppe; ascending a tall pyramid rising from Antarctica's icy landscape.

Phil Risko's team at Northstar works fast to refloat a trawler that's been blown onto the shore of a national park in New Jersey; the team improvises to get it back to sea before it suffers further damage.

A new Olympic and Paralympic museum tests engineers with its trailblazing accessible design. A dazzling curved glass skyscraper battles gravity in Milan. And a student center built under a noisy railroad.

Mike joins crews as they build the world's longest railway tunnel in the Alps, fixing gridlock through the infamous Brenner Pass by drilling, blasting and digging their way through the mountains.

Milwaukee commissions Calatrava to design a museum with 90-ton wings that take flight; Oslo tears down its national ski jump and rebuilds it for the World Championships; and in LA, a 235-foot tower is wrapped in steel bands.

At Cirque du Soleil in Las Vegas, Mike embeds with the talented teams that maintain the amazing machines behind Cirque du Soleil's stage shows.

Flying on one of the biggest helicopters on Earth, on a quest to pull valuable timber from the forest; huge repairs threaten to bring this mission to a halt.

Milwaukee commissions Calatrava to design a museum with 90-ton wings that take flight; Oslo tears down its national ski jump and rebuilds it for the World Championships; and in LA, a 235-foot tower is wrapped in steel bands.

At Cirque du Soleil in Las Vegas, Mike embeds with the talented teams that maintain the amazing machines behind Cirque du Soleil's stage shows.

Flying on one of the biggest helicopters on Earth, on a quest to pull valuable timber from the forest; huge repairs threaten to bring this mission to a halt.

In 1981, the F-117 Nighthawk became the world's first stealth aircraft; explore how its futuristic design made this unconventional aircraft all but invisible to radar; a decade after its inception, the Nighthawk was put to the test in the Gulf War.

Father-son aviators battle turbulence to refuel a remote mine, bush pilots fight an aerial jam to reach Alaska's biggest sled race, and the Coastguard turn a C-130 into a bomber to drop supplies on an isolated beach.

Western Australia is home to colossal gold mines, massive sheep stations, the world's largest shark, a 4x4 trail; it has Perth, the most isolated big city on Earth.

In 1981, the F-117 Nighthawk became the world's first stealth aircraft; explore how its futuristic design made this unconventional aircraft all but invisible to radar; a decade after its inception, the Nighthawk was put to the test in the Gulf War.

Father-son aviators battle turbulence to refuel a remote mine, bush pilots fight an aerial jam to reach Alaska's biggest sled race, and the Coastguard turn a C-130 into a bomber to drop supplies on an isolated beach.

Western Australia is home to colossal gold mines, massive sheep stations, the world's largest shark, a 4x4 trail; it has Perth, the most isolated big city on Earth.

In 1981, the F-117 Nighthawk became the world's first stealth aircraft; explore how its futuristic design made this unconventional aircraft all but invisible to radar; a decade after its inception, the Nighthawk was put to the test in the Gulf War.

Father-son aviators battle turbulence to refuel a remote mine, bush pilots fight an aerial jam to reach Alaska's biggest sled race, and the Coastguard turn a C-130 into a bomber to drop supplies on an isolated beach.

A new Olympic and Paralympic museum tests engineers with its trailblazing accessible design. A dazzling curved glass skyscraper battles gravity in Milan. And a student center built under a noisy railroad.

Mike joins crews as they build the world's longest railway tunnel in the Alps, fixing gridlock through the infamous Brenner Pass by drilling, blasting and digging their way through the mountains.

Bill Nighy narrates a trip along the River Po, traveling across northern Italy from the snow-capped Alps to the delta where it meets the Adriatic Sea.

Exploring some of the most cavernous places on the planet, including an expansive Siberian crater with no explainable origin, Greenland's bizarre black holes, an ancient forbidden well in the Yemeni desert, and a voluminous void in Antarctica.

At the mouth of the Suez Canal, Lino Arosemena and his crew have a monster repair job of removing and refitting a 20-ton propeller.

Bill Nighy narrates a trip along the River Po, traveling across northern Italy from the snow-capped Alps to the delta where it meets the Adriatic Sea.

Exploring some of the most cavernous places on the planet, including an expansive Siberian crater with no explainable origin, Greenland's bizarre black holes, an ancient forbidden well in the Yemeni desert, and a voluminous void in Antarctica.

At the mouth of the Suez Canal, Lino Arosemena and his crew have a monster repair job of removing and refitting a 20-ton propeller.

Architects and engineers build an eco-friendly convention center on Vancouver's waterfront, a lift bridge in Bordeaux and a cocoon-shaped skyscraper in Tokyo each with unique challenges like marine habitats and massive spans.

Mike works with repair and construction teams at Dreamworld, Australia's largest theme park, after a cyclone caused $4M in damage; they fix scream machines and finish a $50M expansion featuring the world's first triple switch rollercoaster.

In 1981, the F-117 Nighthawk became the world's first stealth aircraft; explore how its futuristic design made this unconventional aircraft all but invisible to radar; a decade after its inception, the Nighthawk was put to the test in the Gulf War.

Father-son aviators battle turbulence to refuel a remote mine, bush pilots fight an aerial jam to reach Alaska's biggest sled race, and the Coastguard turn a C-130 into a bomber to drop supplies on an isolated beach.

Western Australia is home to colossal gold mines, massive sheep stations, the world's largest shark, a 4x4 trail; it has Perth, the most isolated big city on Earth.

In 1981, the F-117 Nighthawk became the world's first stealth aircraft; explore how its futuristic design made this unconventional aircraft all but invisible to radar; a decade after its inception, the Nighthawk was put to the test in the Gulf War.

Father-son aviators battle turbulence to refuel a remote mine, bush pilots fight an aerial jam to reach Alaska's biggest sled race, and the Coastguard turn a C-130 into a bomber to drop supplies on an isolated beach.

Western Australia is home to colossal gold mines, massive sheep stations, the world's largest shark, a 4x4 trail; it has Perth, the most isolated big city on Earth.

A look at the rise and fall of the airship; the U.S. military's failed attempts to make it the future of warfare in the 1920s and '30s.

In less than 200 years, the Aztecs rose from nomadic origins to build the powerful empire of Tenochtitlan; combining archaeology and stunning 3D reconstructions, this series reveals the rise and fall of a remarkable civilization.

Consider the factors that inevitably cause dictatorships to crumble; look at how hubris destroys cults of personality; see how factions fracture military dictatorships; weigh the miscalculations that turn the tide against tyranny.

A look at the rise and fall of the airship; the U.S. military's failed attempts to make it the future of warfare in the 1920s and '30s.