TV Guide Smithsonian Wednesday

The luxurious Rovos Rail travels from Pretoria to Cape Town, South Africa, in classic carriages pulled by a series of steam, diesel and electric locomotives.

A train called the North Rail Express is followed as it travels from the Arctic Coast through a hazardous route to deliver freshly caught seafood.

The Roald Amundsen sails where few ships will ever go, the vessel was built specifically to take passengers on an unforgettable voyage to Antarctica.

Costa Diadema is a Dream-class cruise ship owned by Carnival Corporation which gives its 3,700 passengers the ultimate Mediterranean experience.

The Diamond Princess is a British-registered cruise ship owned and operated by Princess Cruises, carrying passengers to some of Japan's most iconic cities.

The world's first cruise ship running on liquefied natural gas, AIDAnova visits the volcanic landscape and stunning beaches of the Canary Islands and Madeira.

Engineers are put to the test with a new Olympic and Paralympic museum's cutting-edge accessible design and a gravity-defying curved glass skyscraper in Milan.

Exploring the engineering and design history behind a renovated 145-year-old museum, an innovative condo in Miami and the world's steepest mountain railway.

A mountain-top center defies extreme altitude; a stunning museum is sunk into an old dock; a 600-foot tower with floating gardens rises in Singapore.

Engineers, architects and other experts discuss the stories behind a sports museum in Louisiana, a school on stilts in Canada and a Belgian train station.

Host Jay Ellis uncovers the design and engineering secrets surrounding the Grand Canyon Skywalk and goes to the Audain Museum in British Columbia.

An in-depth look at numerous innovative structures around the world includes a horseshoe-shaped complex in Rotterdam and a rock-shaped opera house in China.

Host Mike Davidson goes to Brazil to meet up with a crew who's racing against the clock to use powerships to deliver electricity to a country in need.

Mike works with an aerial firefighting company, fixing and converting a 1960's C130 plane military aircraft into a waterbomber ready for wildfire season.

Host Mike Davidson goes to the Alps to help a team install a new cable on a gondola line, fix a steep cogwheel railway track and visits a family farm.

Host Mike Davidson joins some engineers as they work to build the world's longest railway, fix the gridlock and blast and dig their way through the mountains.

A new museum building bends 1,100-glass tubes to form a facade & tunnels below the water table; an 11-storey glass atrium is built on the former Berlin Wall.

Host Jay Ellis visits the American Museum of Natural History, an arts center inspired by migrating birds and built on a lake and Boston University.

Designers share what inspired their radical structural ideas, including a unique port authority building in Belgium and a skinny skyscraper in Manhattan.

A new performance center with a tent-like glass-and-steel lobby tests engineers in Kansas City; two twisting apartment towers make heads spin in Ontario.

The engineering and design history behind the Museum of African American History, the Montreal Tower once abandoned and the Equinor building in Oslo.

A plane carrying footballer Emiliano Sala vanishes over the English Channel, but questions are raised when investigators find the wreckage.

When two float planes carrying tourists collide near a spectacular Alaskan waterfall, investigators turn to 3D technology to figure out why.

Catastrophes caused by quick decisions.

A Russian commercial flight ends in a fatal nosedive and what investigators eventually uncover leads to a call to overhaul the country's aviation system.

When a U.S. military aircraft hit a mountain two miles from its destination in Croatia, killing all on board, theories about the crash's cause abounded.

As a British Airways flight was about to land both engines suddenly slowed to idle speed, and the aircraft struck the ground just short of the runway.

Shortly after takeoff from an airport in Cameroon during a thunderstorm, the pilots suffered from spatial disorientation, which lead to a wreck.

A flight returning U.S. soldiers from Egypt to their home base in Fort Campbell, Ky., begins the third leg of its journey at Gander Field in Newfoundland.

When a Boeing 737 airliner veers off the runway at Denver International Airport, investigators try to determine what caused the accident.