Do you mean the small section near St Audeons Church? There’s a park on top and a much blighted street at the bottom. I have often though of this as a much undervalued landmark. My suggestion: an openair theatre venue like the Globe in London.
Wailing Wall – Jerusalem
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City walls in eyre square centre – yuk
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There’s bound to be some Spanish stuff.. didn’t Torres do something involving a canopy?
And how about that architect in Spain/Italy who stripped all the trees off a “cashel” site and inserted a new lift shaft in?
…. or if there aren’t many examples of new work actually engaging ( rather than avoiding ) historical walls – – – how about looking at other similar structures like elevated brick/stone railways such as S Bahn in Berlin?…