‘That’ door next to Bristol Bridge/Castle Park that everyone knows!

‘That’ door next to Bristol Bridge/Castle Park that everyone knows!
A huge detention tank under the city of Bristol. After a few years of trying to find this place, it was a bit of a triumph amongst us locals to be honest.
A mothballed miniature railway system deep under central London. This one is a bit special…
Construction of the railway was funded by the publisher George Newnes, also proprietor of the Lynton and Lynmouth Cliff Railway,
Not Dreadnaught! Often forgotten about, Rednaught is actually quite a long one.
Probably Bristol’s most visited storm drain. Extending underground from Bishopsworth to its outfall at the river Avon by Coronation Road, it’s a relatively easy one to walk albeit fairly uneventful.