A bunker is a manmade underground structure which is often reinforced to withstand attack.
Bunker rang in size from small four man ROC Posts to vast underground cities.
Little Sodbury - An Royal Observe Corp post.
Burlington - A huge underground city.
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- Box Tunnel
A two mile long tunnel, built by Isambard Kingdom Brunel through Box Hill. Next to the eastern entrance of the tunnel you can see the remains of a branch from the main London to Bristol railway line which lead into the hillside into the Corsham Ammunitions Depot and terminated at a half-mile long underground railway station which was used during World War II.