Smithsonian HD Network

From corrosion and metal fatigue to faulty repairs, three doomed airlines are brought down by gradually deteriorating parts.

Polish Air Force Flight 101, carrying the President of Poland Lech Kaczyński, his wife Maria Kaczyńska and other top officials, crashes in a wooded area while on final approach to Smolensk North Airport in heavy fog and low visibility.

A billion-dollar Stealth Bomber crashes at a U.S. Air Force base-the costliest aviation disaster ever; bad data misleads a charter flight into a Portuguese mountain; conflicting alarms send a cutting-edge jetliner plunging into the Atlantic.

With hidden flaws buried in their navigation systems, three planes suffer catastrophic computer errors that force investigators to dig deep for clues.

Caught in a major tropical storm, a 737 crashes just short of the runway on a Caribbean island, but the accident may not have been weather-related.

Sailing from Chile and Peru to Ecuador and Costa Rica, the luxurious Seven Seas Explorer cruise ship is full of marble, granite and almost 500 chandeliers.

We hop aboard a seven-day cruise to the Canary Islands and Madeira aboard the first large liner to run purely on cleaner-burning liquefied natural gas.

Facing Australia's fierce heat, Celebrity Solstice provides guests with views of waterfalls, jumping crocodiles, koalas and the Great Barrier Reef.

The only cruise ship designed specifically to navigate the treasures and dangers at the southern tip of South America.

Follow mega cruiser Regal Princess as she whisks guests to Germany, Russia, and Scandinavia in style.

We follow passengers and crew aboard Viking Star during its two-week tour from Barcelona to its home port in Bergen, Norway.

South Africa's most luxurious train - Rovos Rail - travels from Pretoria to Cape Town in classic cars pulled by a series of steam, diesel and electric locomotives.

Japan's Tōkaidō Shinkansen, known as the bullet train, operates on a dedicated railway line at up to 177 mph.

A trip aboard one of the world's most expensive and sought-after train rides details the journey for both passengers and crew.

The Norwegian Breakaway cruise ship sets sail on her first voyage, and her captain faces a tough decision when a North Atlantic tempest forms.

Follow the building of the Norwegian Breakaway at Germany's Meyer Werft shipyard; it is the largest ship they've ever built, and they have only 18 months to finish it.

The world's most adventurous cruise ship, MS Fram, battles ice-choked fjords of Greenland to visit wildlife and icebergs.

The new Viking Sea cruise ship whisks guests away on a journey across the Arctic Circle and into the heart of Norway.

The Carnival Vista is the new flagship for one of the world's largest cruise lines, carrying more than 4,600 passengers and boasting 10 restaurants, nearly 2,000 staterooms and a crew of 1,400.

The German Air Force is overhauling their entire fleet of outdated cargo planes, and replacing them with Airbus' latest state-of-the-art military aircraft, the A400M, which can haul massive loads.

Passengers on Ecuador's Tren Crucero experience a dangerous rail journey, which includes tropical jungles, volcanoes and the Devil's Nose.

Royal Clipper is the largest sailing cruise ship in the world, celebrating tall ships of the 19th century while offering modern-day service for its guests.

Azamara Journey travels the rivers of Southeast Asia, delivering passengers to exotic cities and hidden treasures that larger cruise ships cannot reach.

Switzerland's Bernina Express is one of three railway lines on the UNESCO World Heritage list; it navigates 55 tunnels and nearly 200 viaducts and bridges.