Bricked up conduit
Bricked up bunker , a photo by bishib70 on Flickr. This bricked up bunker in Greenwich Park is possibly something to do with an old underground water system, a conduit for Greenwich Palace.
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Inside Greenwich foot tunnel
The Greenwich Foot Tunnel was opened in 1902. This photograph shows a section that was bomb damaged during World War 2 and then repaired with large steel walls, but further down the tunnel you can see original walls and the tunnel's original breadth.