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| Holborn Viaduct, from the north. |
Holborn Viaduct was designed by the City Surveyor, William Heywood, as a way to connect Holborn with Newgate Street, over the Fleet valley.
Work began in 1863 and took six years to complete, at a cost of around £2.5 million. It is 1,440 feet (438 metres) long and 80 feet (24 metres) wide.
