Under all the cities of prehistoric civilization there are brick tunnels for underground transport, to which the way is closed.
Thanks to diggers, we can still see these incredible architectural marvels underground. And who now admits that in the second half of the 19th and early 20th centuries, Europe dug out, clay-clogged pneumatic subways, then restored and rebuilt prehistoric tunnel systems?
London's first subway line opened in 1863. New York City in 1868. The French subway in Paris opened in 1900. Its construction began with a project in 1871, with the discovery, again, of those old, dirt-clogged tunnels of the pneumatic prehistoric subway.
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