Crystal Palace Subway
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Closed to the public, except for special events.
This gem of Crystal Palace, a Grade II-listed Victorian subway, was originally built to connect the neo-gothic railway station to the once grand Crystal Palace back in 1865. While not currently open to the public, look out for rare open days when you can have a look at its eye-popping diamond-shaped design. Be warned: whenever this place is open for visitors expect long, long queues.