U and YESTERDAY+1

The underground base with the power to destroy a nation, the site linked with an attempt to kill a dictator, and an ancient world discovered in the American wilderness.

Claustrophobic prison cells that contain a story worthy of international acclaim, and a vast mountainside complex that held the power to change the world.

Michael Portillo travels down the spine of Italy from Rome to Sicily, along the way visiting Naples to find out about the country's first railway.

Michael Portillo uses his 1913 copy of Bradshaw's Continental Railway Guide to explore Poland, visiting Warsaw, Lodz, Poznan, Wroclaw and Krakow along the way.

Timothy West and Prunella Scales travel along the Forth and Clyde Canal and the Union Canal in a coast-to-coast adventure from Edinburgh to Glasgow.

Timothy West and Prunella Scales travel down the Stratford-upon-Avon Canal, revisiting places from the early stages of their relationship and acting careers.

Robbie takes a detour to investigate a local UFO legend in Todmorden, and the UK's deepest canal lock springs a leak, causing trouble for the Naughty Lass.

Robbie Cumming navigates the scenic Oxford Canal onboard Naughty Lass, explores its twists and turns, and helps tow a stranded broken-down boater.

Robbie navigates the Oxford Canal, bumps into a hire boat and a hedge and tackles large river locks on the scenic Upper River Thames.

On the 100th anniversary of the Russian Revolution, Simon Reeve embarks on a journey from the snow-capped volcanoes of Kamchatka and Yakutia to the port of Vladivostok and on to Siberia.

Simon's journey leads him to a commemoration of the Second World War in the city of Irkutsk, and he meets a Siberian community who worship a man claiming to be the reincarnation of Christ.

After King Harold's brother Tostig attacks the south coast, another enemy strikes when a Viking force lands in the north. Harold must fight for his kingdom - and life.

After months trapped in a port in France, Duke William leads his invasion fleet across the Channel - but King Harold is 300 miles away, having defeated the Vikings.

Michael travels to India to uncover how the British East India Company - the world's first multinational corporation - raised a private army to create an empire.

Aston Martin DB6/BMW 2002/Land Rover/Citroen Avant/Lamborghini Gallardo/Jeep: Derek picks up three classics, including a sought-after BMW 2002, from a grand aristocratic estate.

Paul heads to County Durham for a 1936 Singer Le Mans sports car and a 1957, one-owner Lambretta LD 150, while Derek gets his hands on a 1962 MGA MK2 Coupe.

Robbie takes a detour to investigate a local UFO legend in Todmorden, and the UK's deepest canal lock springs a leak, causing trouble for the Naughty Lass.