We often know and recognize the skyline of cities but are completely unaware of what is hidden underground: discover the underground city in the Australian desert, learn about Canada's shopping arcades or New York's spider-web-like underground transport network.The last page features the most striking and audacious underground constructions such as the Channel Tunnel linking the UK to France.

We often know and recognize the skyline of cities but are completely unaware of what is hidden underground: discover the underground city in the Australian desert, learn about Canada's shopping arcades or New York's spider-web-like underground transport network.The last page features the most striking and audacious underground constructions such as the Channel Tunnel linking the UK to France.