Yesterday HD Tuesday

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A look at some of Switzerland's 300,000 subterranean bunkers, built across history. Plus, the extraordinary creation of a Liverpool entrepreneur that is shrouded in mystery

The Wieliczka Salt mine in southern Poland, some 327 metres deep, where the voids left behind from excavating salt have been transformed into extraordinary spaces, carved by hand

Exploring the ruined site of Troy, that helped decode one of the world's most enduring mysteries

Exploring Seodaemun Prison, a facility in Seoul that helped spawn a legend known as South Korea's Joan of Arc

Focusing on the mass production of ammunition brought on by Samuel Colt, and the inadequacy of Soviet factory production which made the AK47 so effective

An account of Hitler's decision to invade the Soviet Union, which produced an initial series of dazzling victories until the harsh winter of 1941 took its toll

Robbie Cumming explores the English canal network, beginning with a journey from Shardlow to Etruria Junction, Stoke on Trent, exploring the Trent and Mersey Canal

Robbie Cumming explores the English canal network. A low canal tunnel in Staffordshire proves to be problematic and Robbie helps out a stranded boater

Fiona Bruce and the experts visit the seafront at Eastbourne, where items include a collection of pottery, a signalling lamp used during D-Day and rare images of Marilyn Monroe

Derek heads off to collect some vintage motorcycles from a garage at the bottom of the garden in the North-East of England

Dave finds two rare Fiats and a VW Corrado. Derek has his work cut out trying to remove an old Morris that appears to be supporting the garage roof. What could possibly go wrong?

The First World War led to a number of astounding war factories, which laid the foundations and paved the way for modern factories of today

Laurence Olivier narrates events leading up to the Japanese attack on Pearl Harbour on December 7, 1941. Includes interviews with veterans from both sides

Fiona Bruce and the experts visit the seafront at Eastbourne, where items include a collection of pottery, a signalling lamp used during D-Day and rare images of Marilyn Monroe

Robbie Cumming continues across the Pennines from Marple to Huddersfield, where his journey is hampered by a fallen tree and a leaking lock pound

Robbie Cumming travels along the Rochdale Canal from Sowerby Bridge to Manchester, but disaster strikes when he runs aground

The team lift the shutters on their biggest restoration to date in the shape of a Series 1 Land Rover. But does that mean record profit or history making loss?

Derek heads off to Blackpool to pick up a couple of unusual vehicles - a red 1970 Opel GT and a 1956 Ford Hot Rod pickup

Derek heads off to collect some vintage motorcycles from a garage at the bottom of the garden in the North-East of England

Exploring the ruined site of Troy, that helped decode one of the world's most enduring mysteries

Michael Portillo discovers the secrets of backyard oil drilling in Los Angeles - home to the largest urban oil field in the US - and joins the locals for Mexican Independence Day

Tony Robinson leaps ahead to explore artificial intelligence, from a humanoid robot that answers back to the little workhorses that make next-day delivery possible

Tony Robinson explores machines that help us mere mortals become superhuman, from a tree-chopping-device to a jet-powered suit that could be worn by flying paramedics

A chance to buy goods from the comfort of home

A labyrinth of tunnels underneath a tiny French village which contains mysteries from several historical eras, and a Welsh slate mine that has been given a new lease of life