An underground school, Lloyd's of London and The Foreign and Commonwealth Office are all opening their doors for Open House London 2008.
Seven hundred buildings - the large, the small and the quirky - are joining in this weekend's celebration of the best in architectural design.
They range from private homes to skyline icons, and modern wonders to Victorian splendour.
Take a guided tour with the people who know these buildings best.
There are no captions with this slideshow.
Slideshow production by Paul Kerley.
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Open House London homepage
Open House at Lloyd's of London
St Marylebone C.E. School architects
Open House at The Foreign and Commonwealth Office
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