The Budapest Metro, circa 1896, showing how this, the 2nd underground system in the world, was constructed in the open and then covered over with a roadway, (Andrassy Avenue)

Drawing of the Millennium Underground in Budapest which was the second underground in the world - Hungary

Underground cross-section shows what's underneath Piccadilly Circus

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Piccadilly Circus cutaway, London Transport Museum, Illustration by Gavin Dunn. from 27 Cutaway Drawings That Show All The Secrets Of Buildings

Vine tree bearing fruit and cross section of the root system deep underground

Vine tree bearing fruit and cross section of the root system deep underground

In 1914, the Underground Electric Railways Company of London advertised the opening of the Charing Cross, Euston and Hampstead Railway extension to Embankment tube station. This detail from the poster shows a cross-section of the land under Charing Cross railway station including the new tube line and other tube lines already serving the station.

Historical Diagram: Charing Cross/Embankment Tube Station Cutaway, 1914 Simply stunning cutaway cross-section of the London Tube station now known as Embankment in This drawing shows the station.

Concept art for the underground city of Shambala.  Seen here is a cross section of the great pit, a main street of sorts, that rises up in a continuing effort to reach the surface and reclaim it after thousands of years of living underground.

Concept art for the underground city of Shambala. Seen here is a cross section of the great pit, a main street of sorts, that rises up in a continuing effort to reach the surface and reclaim it after thousands of years of living underground.

a sectional view of the new york public library

A sectional view of the New York Public Library. Cover of Scientific American, May Image via the New York Public Library.

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