Urban Exploration uk
Kingsway tunnels

taken from wiki

The Kingsway Tramway Subway was a cut-and-cover tunnel in central London, built by the London County Council. The decision in 1898 to clear slum districts in the Holborn area provided an opportunity to use the new streets for a tramway connecting the lines in the north and south and, following the pattern of tramway systems in New York (the Murray Hill Tunnel) and Boston (the MBTA Green Line), it was decided to build this as an underground connection.

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