You would not expect this under a roundabout !.

Well curiosity got the better of me, due to years of going around this roundabout I noticed a strange small double wall and what looked to be a step going down !, after all its hard to see the step when your flying around a roundabout.....

Blocked passage which I think goes on !.

Hmmmmmm strange !.

Looking into the roof there are 4 of these within the passages.

The way in or is that out !.

Outside looking down the steps.

The way in !.