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Rob Bell explores the ingenious engineering compromises that created Tower Bridge, whose history is entertwined with Empire, the people of the East End and the Blitz.

Rob Bell charts the societal changes that made Westminster Bridge possible, including a greater sense of national self-confidence and power.

Rob Bell uncovers the history of London Bridge, which for 17 centuries was the only bridge across the Thames in central London.

At the outbreak of the Second World War, the Nazis had the finest air fleet in the world. Just five years later it was a force broken by Hitler's obsessions and internal squabbles.

James discovers the truth behind Hitler's feared Panzer divisions and explores how the Germans' over-engineering of their armoured vehicles brought about their downfall.

James goes to the depths with the dreaded Wolf Packs and uncovers how Hitler's failure to understand maritime warfare held the key to the outcome of the war.

James tests out just how effective German weaponry was in battle conditions and how their incredible craftsmanship was totally unsuited to fighting a long attritional war.

Tim Dunn and Siddy Holloway visit the cathedral-like Greenwich Power Station, which stands ready to power the Tube at short notice. Siddy visits hidden parts of Notting Hill Gate.

Tim Dunn and Siddy Holloway explore King's Cross St. Pancras, including a secret siding and the disused Thameslink station. Siddy also discovers long-lost Marlborough Road station.

Tim Dunn and Siddy Holloway explore the Tube station with the most platforms, Baker Street. Siddy visits the disused Edgware Road Signal Cabin with its very last operator.

Tim Dunn and Siddy Holloway explore the labyrinthine Camden Town station and the forgotten wartime shelter built beneath. Siddy visits a station that hides a lost river.

Tim Dunn and Siddy Holloway explore the disused areas of South Kensington station, visiting platforms reclaimed by nature and hearing stories of its wartime purpose. Siddy also heads to Marylebone.

Tim Dunn and Siddy Holloway explore the disused areas of Green Park and discover their incredible wartime purpose. Also, the secrets of atmospheric, abandoned Down Street are revealed.

Tim Dunn and Siddy Holloway embark on a night-time track walk to the abandoned station of British Museum. Siddy explores the quirky history of Leinster Gardens.

Tim Dunn and Siddy Holloway visit the 273rd station on the network, one which no passenger will ever visit. Siddy sees new life breathed into a long-abandoned lift shaft at Oval.

Tim Dunn and Siddy Holloway head to Leicester Square, the gateway to London’s theatreland, full of design and wartime secrets. Siddy visits the world-famous Hyde Park Corner.

Tim Dunn and Siddy Holloway are packing their bags to discover the hidden corners of Heathrow's Underground. Siddy explores the subterranean world at Swiss Cottage station.

Tim Dunn and Siddy Holloway discover the hidden corners of Shepherd’s Bush and hit the end of the line at Elephant and Castle, the Bakerloo Line’s southern terminus.

Tim Dunn and Siddy Holloway explore the sprawling TFL maintenance facility - Acton Works. Staying in Acton, Siddy reveals an oddity of Underground history.

Tim Dunn and Siddy Holloway have access to the secret spaces of Archway, from cavernous lift shafts to sealed-off tunnels. Siddy also visits the Tube’s own Emergency Service.

Tim Dunn and Siddy Holloway visit Quainton Road in rural Buckinghamshire, 50 miles from central London - and once on the Underground. Siddy also explores Kingsway tramway tunnel.

Tim Dunn and Siddy Holloway explore the brand-new Elizabeth Line - and have access to two of its stations weeks before the line opens. Siddy explores the disused parts of Angel.

Tim Dunn and Siddy Holloway explore the disused parts of London Bridge. Siddy visits Ongar in Essex and nearby Blake Hall which, at the end, served less than 20 passengers a day.

Tim Dunn and Siddy Holloway walk the Piccadilly line at night to explore the hidden Second World War remains of Brompton Road. Siddy reveals the unexpected wartime use for St. Paul's.

Tim Dunn and Siddy Holloway visit King William Street, the earliest disused station on the deep tube. Siddy sees new life breathed into Knightsbridge’s long-abandoned lifts.

Tim Dunn and Siddy Holloway discover the hidden world of the Waterloo & City, the only line entirely underground. Siddy explores abandoned Mark Lane by the Tower of London.

Tim Dunn and Siddy Holloway explore the disused Jubilee line areas of Charing Cross station, now more famous as a film location. Siddy walks the Kennington Loop.

Tim Dunn and Siddy Holloway explore Clapham South's deep-level shelter, where thousands of Londoners slept during the war. Siddy sees the remains of a tunnelling machine at Moorgate.

Tim Dunn and Siddy Holloway have a night-time track walk exploring long-forgotten stations on the District line in Whitechapel. Siddy shows us the sprawling disused parts of Oxford Circus.

Tim Dunn and Siddy Holloway explore the hidden parts of Euston, including unique features not found elsewhere. Siddy visits York Road station, unused by passengers for nearly 90 years.

Tim Dunn and Siddy Holloway explore the disused parts of Piccadilly Circus, the Underground's grandest station. Siddy visits the abandoned station above Highgate.

Tim Dunn and Siddy Holloway visit one of the Underground’s most secret places: North End under Hampstead Heath, abandoned before completion. Siddy takes us on a tour of Embankment's floodgates.

Tim Dunn and Siddy Holloway explore the shortest branch line on the London Underground network. Siddy visits the site of one of the Tube's most bizarre inventions: a spiral elevator.

Fiona and Philip investigate whether a canvas covered in white paint could be by a pioneer of Abstract Expressionism, the Armenian American artist Arshile Gorky.