2003 - millions watch live as Columbia breaks up in the sky over Texas, killing all on board. NASA, loved ones and investigators share how an incredible journey ended in tragedy.

As Nasa prepares Space Shuttle Columbia for its 28th mission, excitement and trepidation build amongst the astronauts and their families as they count down to launch.

Nasa engineers analyse film footage of a piece of debris striking the shuttle Columbia 81 seconds after launch. What no-one yet knows is whether any serious damage has been done to the vehicle or the tiles which protect the vehicle against the intense heat of re-entry.

Sixteen minutes from landing, mission control lose contact with the crew of Columbia. On the shuttle landing strip, families waiting to welcome their loved ones back home are swiftly ushered away.

In 2011, after more than 30 years of service, America's space shuttle took to the skies for the last time. Its story has been characterised by incredible triumphs, but blighted by devastating tragedies - and the BBC and Horizon have chronicled every step of its career.

The surprising story of the hidden powerhouse behind the globalised world - the diesel engine, a 19th-century invention that has become indispensable to the 21st century.

Professor Jeremy Black examines one of the most extraordinary periods in British history: the Industrial Revolution. He explains the unique economic, social and political conditions that by the 19th century, led to Britain becoming the richest, most powerful nation on Earth. It was a time that transformed the way people think, work and play forever.