The Wieliczka Salt mine in Poland, some 327 metres deep, where the voids left behind from excavating salt have been transformed into extraordinary spaces, carved by hand.
All episodes for series 1 of Underground Worlds
S1 E1 · Gibraltar
Incredible feats of human endeavour, revealing what people have built, where, how and why.
S1 E3 · Switzerland
A look at some of Switzerland's 300,000 subterranean bunkers built across history.
S1 E6 · City of Naours
An underground city beneath a forest in Northern France built to house 3,000 people.
S1 E7 · Jersey War Tunnels
The underground bases built by the German army during the occupation of Jersey.
S1 E8 · The Maginot Line
The secrets of the largest subterranean fortress along France's border with Germany.
S1 E10 · Dover War Rooms
The military headquarters built beneath Dover Castle during the Second World War.
The Buildings That Fought Hitler
Description: This series looks at just some of the buildings that were designed to fight Hitler.; Category: Military & War; 8 episodes available.
The Architecture the Railways Built
Description: Tim Dunn explores the stunning architecture that lines the railway network.; Category: Engineering; 40 episodes available.
Guy Martin's World War 1 Tank
Description: Guy builds a working replica of a WWI tank and drives it at a Remembrance Day parade.; Category: Factual Entertainment; 1 episode available.
Guy Martin's Lancaster Bomber
Description: The history enthusiast honours Lancaster bomber crews of the Second World War.; Category: Military & War; 1 episode available.
How Britain Worked
Description: Guy Martin recreates technical achievements of the 19th century.; Category: Engineering; 6 episodes available.
Guy Martin's Spitfire
Description: Guy joins the two-year restoration of a Spitfire that was buried in a French beach.; Category: Engineering; 1 episode available.
David Jason's Secret Service
Description: David Jason offers insights into modern British spy history.; Category: History; 3 episodes available.
Cleopatra's Lost Tomb
Description: An archaeologist's explorations take her to an old temple - is it Cleopatra's lost tomb?; Category: History; 1 episode available.
England's Forgotten Queen: The Life & Death of Lady Jane Grey
Description: The story of the de facto Queen of England and Ireland for nine days in 1553.; Category: History; 3 episodes available.
Yorkshire Steam Railways
Description: A behind-the-scenes look at the North York Moors Railway.; Category: Factual Entertainment; 9 episodes available.
Railway Murders
Description: Investigating the most notorious murders ever to take place on the British railways.; Category: History; 6 episodes available.
Shipwreck Secrets
Description: Shipwrecks worldwide are waiting to be discovered and have their secrets revealed.; Category: History; 6 episodes available.
