Abandoned underground

This is one of my DVDs, Cities of the underworld peels away the layers of time to expose the incredible pasts lurking beneath cities such as Paris, New York, Rome and Shanghai. From long-submerged networks that once served crucial functions, eerie catacombs, ancient aqueducts to clandestine hideouts and underground societies. These episodes explore secret chambers and forbidden passages beneath city streets, unlocking mysteries of the past and discovering forgotten relics.
With each step below street level you travel back decades, even centuries, into the fascinating past of the world's great cities.
This History Channel series examines these mysterious realms, from the technological feats of their construction and the myths and lore that have cloaked these subterranean marvels for centuries. The first series set has 13 episodes on four discs (running for over 600 minutes): Scotland's Sin City, Hitler's Underground Lair, Rome's Hidden Empire, Catacombs of Death, City of Caves, New York, London's Lost Cities, Beneath Vesuvius, Freemason Underground, Dracula's Underground, Secret Pagan Underground, Underground Bootleggers, and Rome: the Rise.
Using computer animation to describe the layouts often superimposed on the current buildings assists the narration and gives you a vision of what it did look like.
Presenter Eric Geller is a bit over enthusiastic, and the bratwurst sausage episode was a bit crass, Don Wildman is better.

It mentions a few of the urban explorers who investigate the underworld - the Berliner Undergrounders, "Cataphiles" illegally tour the Paris catacombs (the series of underground tunnels that were formerly a network of stone mines).
The DVDs also helped place books I’d read – Vlad’s castle and chapel in The Historian by Elizabeth Kostova, Hitler’s architectural dream in Fatherland by Robert Harris, and the Vesuvius eruption in Pompeii by Robert Harris. Oh, and of course, Dan Brown’s Lost Symbol. Even though these books are all fiction, what they are describing is based on fact.