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The Friends of Crystal Palace Subway are crowdfunding to reopen a stunning 150-year-old secret underpass to the public. The Grade II-listed vaulted walkway first opened in 1865 as a swanky entrance to the Crystal Palace for first-class passengers travelling by the railway station nearby. It's since been used as an air raid shelter, a children's playground and a site for illegal raves but was closed to the public 20 years ago over safety concerns. They've raised enough money to start reinstating safe access to the site, but they still need more funds to carry out all the necessary works. There's no substitute for the subterranean. Help them!
Find out more about the crowdfunding campaign.
In other news, a wooden skyscraper might be coming to London.