An abstract view of the National Assembly of Wales in Cardiff (@ Andrew Holt/Getty Images)

An abstract view of the National Assembly of Wales in Cardiff (@ Andrew Holt/Getty Images)

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• This undulating roof is just one feature of an environmentally-friendly architectural tour-de-force.""It\s where important people like to assemble
• As amazing as it is, don\t spend all day gazing at the ceiling - celebrations are in order.""Can you guess which city - named Welsh capital on this day 1955 - we\re toasting?
• A lot of debating goes on here but the inspiring achievement of the designer is not in doubt.""Which towering new challenge is one of his next projects?
• The man behind this is said to have \"turned the architecture world upside down“ in 1977.""What radical building earned such a commendation?