Underground Cities: Mapping the tunnels, transits and networks underneath our feet

Underground Cities looks at how the space beneath our streets is used in increasingly innovative and fascinating ways. From historical oddities, such as Berlin's hidden tunnels and Paris's catacombs to the building of modern subway systems and underground shopping malls and including today's pioneering engineering feats - such as, London's Crossrail and Tokyo's complex bicycle storage vaults - the innovations and engineering wonders of our cities underbellies are revealed like never before.