Underground Cities

With over 60 per cent of the world’s population living in cities, the networks beneath our feet – which keep the cities above moving – are more important than ever before. Yet we never truly see how these amazing feats of engineering work.<br > &nbsp;<br > Just how deep do the tunnels go? Where do the sewers, bunkers and postal trains run? And, how many tunnels are there under our streets? Each featured city presents a ‘skyline of the underground’&nbsp; through specially commissioned cut-away illustrations and unique cartography.&nbsp;<br > <br > Drawing on geography, cartography and historical oddities, Mark Ovenden explores what our cities look like from the bottom up.