Often hailed as a stunning example of Victorian engineering, this pedestrian subway can be found hidden under the Crystal Palace parade in southeast London. Opened in 1865, the subway was built to provide easier access to the Crystal Palace, a popular entertainment venue that was originally erected in Hyde Park to house the Great Exhibition in 1851. The grand palace was unfortunately destroyed in a fire in 1936 but the ruined subway survived and is now a Grade II-listed landmark.

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London, But Not As You know It: Forgotten Gems Frozen In Time